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Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Available-for-sale securities, Before-Tax Amount:
Fixed maturities	$ (185)	$ (343)	$ (330)	$ 318
Adjustments for amounts recognized in Net gains (losses) in the Condensed Consolidated Statements of Operations	8	15	24	14
Change in unrealized gains/losses on available-for-sale securities	(177)	(328)	(306)	332
Available-for-sale securities, Income Tax:
Fixed maturities	38	72	68	(67)
Adjustments for amounts recognized in Net gains (losses) in the Condensed Consolidated Statements of Operations	(2)	(3)	(5)	(3)
Change in unrealized gains/losses on available-for-sale securities	36	69	63	(70)
Available-for-sale securities, After-Tax Amount:
Fixed maturities	(147)	(271)	(262)	251
Adjustments for amounts recognized in Net gains (losses) in the Condensed Consolidated Statements of Operations	6	12	19	11
Change in unrealized gains/losses on available-for-sale securities	(141)	(259)	(243)	262
Derivatives, Before-Tax Amount:
Derivatives	3	(6)	11	(18)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(4)	(5)	(8)	(10)
Change in unrealized gains/losses on derivatives	(1)	(11)	3	(28)
Derivatives, Income Tax:
Derivatives	0	1	(2)	4
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	1	1	2	2
Change in unrealized gains/losses on derivatives	1	2	0	6
Derivatives, After-Tax Amount:
Derivatives	3	(5)	9	(14)
Adjustments related to effective cash flow hedges for amounts recognized in Net investment income in the Condensed Consolidated Statements of Operations	(3)	(4)	(6)	(8)
Change in unrealized gains/losses on derivatives	0	(9)	3	(22)
Change in current discount rate, before-tax amount	34	28	72	30
Change in current discount rate, income tax	(7)	(6)	(15)	(6)
Change in current discount rate, after-tax amount	27	22	57	24
Other comprehensive income (loss), before tax	(144)	(311)	(231)	334
Other comprehensive income (loss), tax	30	65	48	(70)
Other comprehensive income (loss), after tax	$ (114)	$ (246)	$ (183)	$ 264

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