Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2021	Nov. 23, 2021
Document Information [Line Items]
Document Type	10-Q/A
Document Period End Date	Sep. 30, 2021
Amendment Flag	true
Amendment Description	Decarbonization Plus Acquisition Corporation II (the “Company,” “we,” “us” or “our”) is filing this Amendment No. 1 on Form 10-Q/A (this “Amendment”) to amend and restate certain items in its Quarterly Report on Form 10-Q as of September 30, 2021 and for the quarterly period ended September 30, 2021, originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on November 15, 2021 (the “Original 10-Q”). Background of Restatement On November 22, 2021, the Board of Directors (the “Board”) of the Company, in consultation with management of the Company and upon the recommendation of the Audit Committee of the Board, concluded that, in light of recent guidance, it is appropriate to restate the Company’s previously issued audited balance sheet as of February 8, 2021, as previously restated in the Company’s Quarterly Report on Form 10-Q filed with the SEC on May 28, 2021 (the “Q1 Form 10-Q”); the Company’s unaudited quarterly financial statements as of and for the three months ended March 31, 2021 included in the Q1 Form 10-Q, and the Company’s unaudited quarterly financial statements as of and for the six months ended June 30, 2021 included in the Company’s Quarterly Report on Form 10-Q filed with the SEC on August 18, 2021 (the “Q2 Form 10-Q” and, together with the Q1 Form 10-Q, the “Non-Reliance Financial Statements”). Considering such restatement, the Company concluded that the Non-Reliance Financial Statements should no longer be relied upon. This Amendment includes restatement of the Non-Reliance Financial Statements. In connection with the preparation of its financial statements as of September 30, 2021, the Company’s management re-evaluated the Company’s application of ASC 480-10-S99-3A to its accounting classification of the redeemable shares of Class A common stock, par value $0.0001 per share (the “Public Shares”), issued as part of the units sold in the Company’s initial public offering (the “IPO”) on February 8, 2021. Historically, a portion of the Public Shares was classified as permanent equity to maintain net tangible assets greater than $5,000,000 on the basis that the Company will consummate its initial business combination only if the Company has net tangible assets of at least $5,000,001. Pursuant to such re-evaluation, the Company’s management determined that the Public Shares include certain provisions that require classification of the Public Shares as temporary equity regardless of the minimum net tangible assets required to complete the Company’s initial business combination. In connection with the change in presentation for the Class A common stock subject to redemption, the Company also restated its earnings per share calculation to allocate net income (loss) pro rata to Class A and Class B common stock. This presentation contemplates an initial business combination as the most likely outcome, in which case, both classes of common stock share pro rata in the income (loss) of the Company. Effects of Restatement As a result of the factors described above, the Company has included in this Amendment a restatement of its financial statements for the periods affected by the Non-Reliance Financial Statements. See Note 2 to the Notes to Financial Statements included in Part I, Item 1 of this Amendment for additional information on the restatement and the related financial statement effects. The Company does not expect these changes will have any impact on its cash position and cash held in the trust account established in connection with the IPO. Internal Control Considerations The Company’s management has concluded that in light of the classification error described above, a material weakness exists in the Company’s internal control over financial reporting and that the Company’s disclosure controls and procedures were not effective. For a discussion of management’s consideration of the material weakness identified, see Part I, Item 4, “Controls and Procedures” of this Amendment.
Entity Central Index Key	0001836154
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Registrant Name	Decarbonization Plus Acquisition Corporation II
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	DE
Entity File Number	001-40000
Entity Tax Identification Number	85-4197795
Entity Address, Address Line One	2744 Sand Hill Road,
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Menlo Park,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94025
City Area Code	212
Local Phone Number	993-0076
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Shell Company	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Document Quarterly Report	true
Document Transition Report	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		40,250,000
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	DCRN
Security Exchange Name	NASDAQ
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		10,062,500
Units
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one share of Class A common stock and one-third of one warrant
Trading Symbol	DCRNU
Security Exchange Name	NASDAQ
Warrants
Document Information [Line Items]
Title of 12(b) Security	Warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 per share
Trading Symbol	DCRNW
Security Exchange Name	NASDAQ

Decarbonization Plus Acquisition Corp II 10-Q/A