Financial Instruments and Fair Value Measures - Debt and Credit Facilities (Details) € in Millions, $ in Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 EUR (€)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Feb. 12, 2024 USD ($)	Dec. 21, 2023 USD ($)	Dec. 06, 2023 USD ($)
Short-Term Borrowings [Line Items]
Short-term borrowings	$ 5,556					$ 5,556		$ 0
Proceeds from issuance of other short-term borrowings						4,007	$ 5,008
Repayments of other short-term borrowings						0	$ 5,008
Commercial paper
Short-Term Borrowings [Line Items]
Short-term borrowings	3,600					$ 3,600
Short-Term Debt, Weighted Average Interest Rate, over Time						4.64%	5.54%
December 2023 Bridge Credit Facility
Short-Term Borrowings [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity											$ 9,000
364-day Term Loan Credit Agreement
Short-Term Borrowings [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	4,000					$ 4,000				$ 5,000
Short-term borrowings	$ 2,000					2,000
Debt Instrument, Basis Spread on Variable Rate	0.70%
Commercial Paper With Original Maturities Greater Than Three Months
Short-Term Borrowings [Line Items]
Short-term borrowings	$ 2,000					$ 2,000
Term loan facilities
Debt and Credit Facilities [Line Items]
Long-Term Debt, Weighted Average Interest Rate, over Time					6.29%
Senior Notes Issued in 2024
Debt and Credit Facilities [Line Items]
Debt Issuance Costs, Gross					$ 99
Debt Instrument, Unamortized Discount					37
Senior Notes Issued in 2024 \| Senior notes
Debt and Credit Facilities [Line Items]
Aggregate principal amount of debt					15,000
December 2023 Term Loan Credit Agreement
Short-Term Borrowings [Line Items]
Proceeds from Other Short-Term Debt					5,000
Repayments of other short-term borrowings					$ 5,000
Debt Instrument, Basis Spread on Variable Rate					0.975%
3.80% Senior Notes \| Senior notes
Debt and Credit Facilities [Line Items]
Stated interest rate (as a percent)		3.80%
3.80% Senior Notes \| Term loan facilities
Debt and Credit Facilities [Line Items]
Repayments of long-term debt		$ (3,000)
4.65% Senior Notes due 2028 \| Senior notes
Debt and Credit Facilities [Line Items]
Stated interest rate (as a percent)	4.65%					4.65%
Aggregate principal amount of debt	$ 1,250					$ 1,250
4.875% Senior Notes due 2030 \| Senior notes
Debt and Credit Facilities [Line Items]
Stated interest rate (as a percent)	4.875%					4.875%
Aggregate principal amount of debt	$ 1,000					$ 1,000
5.20% Senior Notes due 2035 \| Senior notes
Debt and Credit Facilities [Line Items]
Stated interest rate (as a percent)	5.20%					5.20%
Aggregate principal amount of debt	$ 1,000					$ 1,000
5.60% Senior Notes due 2055 \| Senior notes
Debt and Credit Facilities [Line Items]
Stated interest rate (as a percent)	5.60%					5.60%
Aggregate principal amount of debt	$ 750					$ 750
Senior Notes Issued in 2025 \| Senior notes
Debt and Credit Facilities [Line Items]
Aggregate principal amount of debt	$ 4,000					$ 4,000
ImmunoGen Senior Secured Term Loan
Debt and Credit Facilities [Line Items]
Other Long-Term Debt									$ (99)
3.60% Senior Notes \| Senior notes
Debt and Credit Facilities [Line Items]
Stated interest rate (as a percent)	3.60%					3.60%
3.60% Senior Notes \| Term loan facilities
Debt and Credit Facilities [Line Items]
Repayments of long-term debt	$ (3,800)
1.38% Senior Notes \| Senior notes
Debt and Credit Facilities [Line Items]
Stated interest rate (as a percent)			1.38%	1.38%			1.38%
1.38% Senior Notes \| Term loan facilities
Debt and Credit Facilities [Line Items]
Repayments of long-term debt \| €				€ (1,500)
1.25% Senior Euro Notes due 2024 \| Senior notes
Debt and Credit Facilities [Line Items]
Stated interest rate (as a percent)			1.25%	1.25%			1.25%
1.25% Senior Euro Notes due 2024 \| Term loan facilities
Debt and Credit Facilities [Line Items]
Repayments of long-term debt \| €				€ (700)
3.85% Senior Euro Notes due 2024 \| Senior notes
Debt and Credit Facilities [Line Items]
Stated interest rate (as a percent)			3.85%	3.85%			3.85%
3.85% Senior Euro Notes due 2024 \| Term loan facilities
Debt and Credit Facilities [Line Items]
Repayments of long-term debt			$ (1,000)
Revolving Credit Facility
Short-Term Borrowings [Line Items]
Long-Term Line of Credit	$ 0					$ 0		$ 0
Revolving Credit Facility Maturing 2028
Short-Term Borrowings [Line Items]
Line of Credit Facility, Expiration Period	5 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 5,000					5,000
Revolving Credit Facility Maturing 2030
Short-Term Borrowings [Line Items]
Line of Credit Facility, Expiration Period	5 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,000					$ 3,000

AbbVie Inc. 10-Q