v3.25.4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Signficant Accounting Policies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jan. 01, 2021 USD ($)
Significant Accounting Policies [Line Items]
Number of reportable insurance business segments \| segment	2
Advertising expense	$ 160	$ 181	$ 188
Depreciation and other amortization expense	36	40	$ 39
Goodwill	260	263
Retained earnings	$ 54,682	$ 52,277
Percentage that the lending policy requires that the fair value of the securities and/or unrestricted cash received as collateral be of the fair value of the loaned securities	102.00%
Percentage that the lending policy requires that the fair value of the unrestricted cash received as collateral be of the fair value of the loaned securities	100.00%
Building \| Upper Limit
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	50 years
Machinery and equipment \| Upper Limit
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Furniture and fixtures \| Upper Limit
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Accounting Standards Update 2018-12 \| Cumulative effect, period of adoption, adjustment
Significant Accounting Policies [Line Items]
Accumulated other comprehensive income (loss)				$ (18,600)
Retained earnings				$ (300)

Percentage that the lending policy requires that the fair value of the unrestricted cash received as collateral be of the fair value of the loaned securities in securities lending transactions.

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Percentage that the lending policy requires that the fair value of the securities received as collateral be of the fair value of the loaned securities in securities lending transactions.

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Significant Accounting Policies [Line Items]

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Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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