Investments - Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	$ 22,067	$ 22,174
Allowance for Credit Losses	(4)	0
Net Amortized Cost	22,063	22,174
Gross Unrealized Gains	57	1,172
Gross Unrealized Losses	(1,840)	(106)
Fair Value	20,280	23,240
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	2,074	2,349
Allowance for Credit Losses	0	0
Net Amortized Cost	2,074	2,349
Gross Unrealized Gains	0	70
Gross Unrealized Losses	(182)	(3)
Fair Value	1,892	2,416
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	2,393	2,947
Allowance for Credit Losses	0	0
Net Amortized Cost	2,393	2,947
Gross Unrealized Gains	8	148
Gross Unrealized Losses	(129)	(4)
Fair Value	2,272	3,091
U.S. corporate securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	9,838	9,093
Allowance for Credit Losses	(3)	0
Net Amortized Cost	9,835	9,093
Gross Unrealized Gains	26	682
Gross Unrealized Losses	(903)	(40)
Fair Value	8,958	9,735
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	2,780	2,821
Allowance for Credit Losses	(1)	0
Net Amortized Cost	2,779	2,821
Gross Unrealized Gains	15	196
Gross Unrealized Losses	(244)	(24)
Fair Value	2,550	2,993
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	845	870
Allowance for Credit Losses	0	0
Net Amortized Cost	845	870
Gross Unrealized Gains	1	15
Gross Unrealized Losses	(89)	(10)
Fair Value	757	875
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	1,172	1,278
Allowance for Credit Losses	0	0
Net Amortized Cost	1,172	1,278
Gross Unrealized Gains	1	44
Gross Unrealized Losses	(155)	(12)
Fair Value	1,018	1,310
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	2,940	2,791
Allowance for Credit Losses	0	0
Net Amortized Cost	2,940	2,791
Gross Unrealized Gains	6	14
Gross Unrealized Losses	(136)	(13)
Fair Value	2,810	2,792
Redeemable preferred securities
Debt Securities, Available-for-sale [Line Items]
Gross Amortized Cost	25	25
Allowance for Credit Losses	0	0
Net Amortized Cost	25	25
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(2)	0
Fair Value	23	28
Supporting experience- rated products
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	3	94
Gross Unrealized Losses	(59)	(2)
Fair Value	$ 609	$ 864

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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