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Investments - Unrealized Loss Position (Details) $ in Millions	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Number of Securities
Number of Securities, Less than 12 months | security	2,635	1,182
Number of Securities, Greater than 12 months | security	6,576	7,018
Number of Securities | security	9,211	8,200
Fair Value
Fair Value, Less than 12 months	$ 4,578	$ 1,932
Fair Value, Greater than 12 months	9,664	10,616
Fair Value	14,242	12,548
Unrealized Losses
Unrealized Losses, Less than 12 months	47	28
Unrealized Losses, Greater than 12 months	826	808
Unrealized Losses	$ 873	$ 836
U.S. government securities
Number of Securities
Number of Securities, Less than 12 months | security	210	74
Number of Securities, Greater than 12 months | security	273	280
Number of Securities | security	483	354
Fair Value
Fair Value, Less than 12 months	$ 846	$ 194
Fair Value, Greater than 12 months	856	891
Fair Value	1,702	1,085
Unrealized Losses
Unrealized Losses, Less than 12 months	12	2
Unrealized Losses, Greater than 12 months	54	52
Unrealized Losses	$ 66	$ 54
States, municipalities and political subdivisions
Number of Securities
Number of Securities, Less than 12 months | security	260	95
Number of Securities, Greater than 12 months | security	434	455
Number of Securities | security	694	550
Fair Value
Fair Value, Less than 12 months	$ 489	$ 181
Fair Value, Greater than 12 months	682	733
Fair Value	1,171	914
Unrealized Losses
Unrealized Losses, Less than 12 months	3	1
Unrealized Losses, Greater than 12 months	36	34
Unrealized Losses	$ 39	$ 35
U.S. corporate securities
Number of Securities
Number of Securities, Less than 12 months | security	1,413	576
Number of Securities, Greater than 12 months | security	3,995	4,120
Number of Securities | security	5,408	4,696
Fair Value
Fair Value, Less than 12 months	$ 1,720	$ 672
Fair Value, Greater than 12 months	5,260	5,602
Fair Value	6,980	6,274
Unrealized Losses
Unrealized Losses, Less than 12 months	19	14
Unrealized Losses, Greater than 12 months	455	432
Unrealized Losses	$ 474	$ 446
Foreign securities
Number of Securities
Number of Securities, Less than 12 months | security	324	160
Number of Securities, Greater than 12 months | security	915	964
Number of Securities | security	1,239	1,124
Fair Value
Fair Value, Less than 12 months	$ 444	$ 243
Fair Value, Greater than 12 months	1,299	1,407
Fair Value	1,743	1,650
Unrealized Losses
Unrealized Losses, Less than 12 months	7	4
Unrealized Losses, Greater than 12 months	117	118
Unrealized Losses	$ 124	$ 122
Residential mortgage-backed securities
Number of Securities
Number of Securities, Less than 12 months | security	41	33
Number of Securities, Greater than 12 months | security	429	461
Number of Securities | security	470	494
Fair Value
Fair Value, Less than 12 months	$ 143	$ 97
Fair Value, Greater than 12 months	468	517
Fair Value	611	614
Unrealized Losses
Unrealized Losses, Less than 12 months	1	1
Unrealized Losses, Greater than 12 months	61	59
Unrealized Losses	$ 62	$ 60
Commercial mortgage-backed securities
Number of Securities
Number of Securities, Less than 12 months | security	36	44
Number of Securities, Greater than 12 months | security	310	287
Number of Securities | security	346	331
Fair Value
Fair Value, Less than 12 months	$ 84	$ 94
Fair Value, Greater than 12 months	635	581
Fair Value	719	675
Unrealized Losses
Unrealized Losses, Less than 12 months	0	2
Unrealized Losses, Greater than 12 months	93	98
Unrealized Losses	$ 93	$ 100
Other asset-backed securities
Number of Securities
Number of Securities, Less than 12 months | security	351	196
Number of Securities, Greater than 12 months | security	213	443
Number of Securities | security	564	639
Fair Value
Fair Value, Less than 12 months	$ 852	$ 449
Fair Value, Greater than 12 months	451	867
Fair Value	1,303	1,316
Unrealized Losses
Unrealized Losses, Less than 12 months	5	4
Unrealized Losses, Greater than 12 months	10	14
Unrealized Losses	$ 15	$ 18
Redeemable preferred securities
Number of Securities
Number of Securities, Less than 12 months | security	0	4
Number of Securities, Greater than 12 months | security	7	8
Number of Securities | security	7	12
Fair Value
Fair Value, Less than 12 months	$ 0	$ 2
Fair Value, Greater than 12 months	13	18
Fair Value	13	20
Unrealized Losses
Unrealized Losses, Less than 12 months	0	0
Unrealized Losses, Greater than 12 months	0	1
Unrealized Losses	$ 0	$ 1

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