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Investments - Unrealized Loss Position (Details) $ in Millions	Sep. 30, 2025 USD ($) security	Dec. 31, 2024 USD ($) security
Number of Securities
Number of Securities, Less than 12 months | security	1,110	4,502
Number of Securities, Greater than 12 months | security	2,675	4,174
Number of Securities | security	3,785	8,676
Fair Value
Fair Value, Less than 12 months	$ 1,779	$ 7,506
Fair Value, Greater than 12 months	3,661	5,734
Fair Value	5,440	13,240
Unrealized Losses
Unrealized Losses, Less than 12 months	25	127
Unrealized Losses, Greater than 12 months	307	580
Unrealized Losses	$ 332	$ 707
U.S. government securities
Number of Securities
Number of Securities, Less than 12 months | security	42	266
Number of Securities, Greater than 12 months | security	77	155
Number of Securities | security	119	421
Fair Value
Fair Value, Less than 12 months	$ 119	$ 1,053
Fair Value, Greater than 12 months	156	394
Fair Value	275	1,447
Unrealized Losses
Unrealized Losses, Less than 12 months	2	18
Unrealized Losses, Greater than 12 months	5	20
Unrealized Losses	$ 7	$ 38
States, municipalities and political subdivisions
Number of Securities
Number of Securities, Less than 12 months | security	23	100
Number of Securities, Greater than 12 months | security	93	137
Number of Securities | security	116	237
Fair Value
Fair Value, Less than 12 months	$ 51	$ 181
Fair Value, Greater than 12 months	121	201
Fair Value	172	382
Unrealized Losses
Unrealized Losses, Less than 12 months	1	3
Unrealized Losses, Greater than 12 months	7	15
Unrealized Losses	$ 8	$ 18
U.S. corporate securities
Number of Securities
Number of Securities, Less than 12 months | security	690	3,119
Number of Securities, Greater than 12 months | security	1,644	2,602
Number of Securities | security	2,334	5,721
Fair Value
Fair Value, Less than 12 months	$ 920	$ 4,144
Fair Value, Greater than 12 months	2,240	3,395
Fair Value	3,160	7,539
Unrealized Losses
Unrealized Losses, Less than 12 months	17	64
Unrealized Losses, Greater than 12 months	197	348
Unrealized Losses	$ 214	$ 412
Foreign securities
Number of Securities
Number of Securities, Less than 12 months | security	148	599
Number of Securities, Greater than 12 months | security	356	616
Number of Securities | security	504	1,215
Fair Value
Fair Value, Less than 12 months	$ 238	$ 810
Fair Value, Greater than 12 months	520	874
Fair Value	758	1,684
Unrealized Losses
Unrealized Losses, Less than 12 months	3	21
Unrealized Losses, Greater than 12 months	33	90
Unrealized Losses	$ 36	$ 111
Residential mortgage-backed securities
Number of Securities
Number of Securities, Less than 12 months | security	28	89
Number of Securities, Greater than 12 months | security	318	361
Number of Securities | security	346	450
Fair Value
Fair Value, Less than 12 months	$ 59	$ 267
Fair Value, Greater than 12 months	298	342
Fair Value	357	609
Unrealized Losses
Unrealized Losses, Less than 12 months	0	5
Unrealized Losses, Greater than 12 months	34	49
Unrealized Losses	$ 34	$ 54
Commercial mortgage-backed securities
Number of Securities
Number of Securities, Less than 12 months | security	33	186
Number of Securities, Greater than 12 months | security	138	237
Number of Securities | security	171	423
Fair Value
Fair Value, Less than 12 months	$ 117	$ 628
Fair Value, Greater than 12 months	283	464
Fair Value	400	1,092
Unrealized Losses
Unrealized Losses, Less than 12 months	1	11
Unrealized Losses, Greater than 12 months	31	56
Unrealized Losses	$ 32	$ 67
Other asset-backed securities
Number of Securities
Number of Securities, Less than 12 months | security	146	139
Number of Securities, Greater than 12 months | security	45	62
Number of Securities | security	191	201
Fair Value
Fair Value, Less than 12 months	$ 275	$ 414
Fair Value, Greater than 12 months	37	58
Fair Value	312	472
Unrealized Losses
Unrealized Losses, Less than 12 months	1	5
Unrealized Losses, Greater than 12 months	0	2
Unrealized Losses	$ 1	$ 7
Redeemable preferred securities
Number of Securities
Number of Securities, Less than 12 months | security	0	4
Number of Securities, Greater than 12 months | security	4	4
Number of Securities | security	4	8
Fair Value
Fair Value, Less than 12 months	$ 0	$ 9
Fair Value, Greater than 12 months	6	6
Fair Value	6	15
Unrealized Losses
Unrealized Losses, Less than 12 months	0	0
Unrealized Losses, Greater than 12 months	0	0
Unrealized Losses	$ 0	$ 0

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