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Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Before-Tax Amount
Available-for-sale securities, fixed maturities	$ 813	$ (208)	$ 899
Adjustments for amounts recognized in Net gains (losses) in the Consolidated Statements of Operations	64	26	25
Change in unrealized gains/losses on available-for-sale securities	877	(182)	924
Derivatives	(54)	18	(43)
Adjustments for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(10)	(16)	(18)
Change in unrealized gains (losses) on derivatives	(64)	2	(61)
Change in current discount rate	42	103	(33)
Amortization of prior service cost recognized in Operating expenses in the Consolidated Statements of Operations	(1)	(1)	(1)
Change in pension and other postretirement benefits liability	(1)	(1)	(1)
Other comprehensive income (loss), before tax	854	(78)	829
Income Tax
Available-for-sale securities, fixed maturities	(171)	44	(189)
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	(13)	(5)	(5)
Change in unrealized gains/losses on available-for-sale securities	(184)	39	(194)
Derivatives	11	(4)	9
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Consolidated Statements of Operations	2	3	4
Change in unrealized gains (losses) on derivatives	13	(1)	13
Change in current discount rate	(9)	(22)	7
Amortization of prior service cost recognized in Operating expenses in the Condensed Consolidated Statements of Operations	0	0	0
Change in pension and other postretirement benefits liability	0	0	0
Change in Other comprehensive income (loss)	(180)	16	(174)
After-Tax Amount
Available-for-sale securities, fixed maturities	642	(164)	710
Adjustments for amounts recognized in Net realized capital gains (losses) in the Condensed Consolidated Statements of Operations	51	21	20
Change in unrealized gains/losses on available-for-sale securities	693	(143)	730
Derivatives	(43)	14	(34)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Consolidated Statements of Operations	(8)	(13)	(14)
Change in unrealized gains (losses) on derivatives	(51)	1	(48)
Change in current discount rate	33	81	(26)
Amortization of prior service cost recognized in Operating expenses in the Condensed Consolidated Statements of Operations	(1)	(1)	(1)
Change in pension and other postretirement benefits liability	(1)	(1)	(1)
Other comprehensive income (loss), after tax	$ 674	$ (62)	$ 655

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