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Investments - Unrealized Loss Position (Details) $ in Millions	Jun. 30, 2025 USD ($) security	Dec. 31, 2024 USD ($) security
Number of Securities
Number of Securities, Less than 12 months | security	1,528	4,502
Number of Securities, Greater than 12 months | security	3,068	4,174
Number of Securities | security	4,596	8,676
Fair Value
Fair Value, Less than 12 months	$ 2,510	$ 7,506
Fair Value, Greater than 12 months	4,137	5,734
Fair Value	6,647	13,240
Unrealized Losses
Unrealized Losses, Less than 12 months	53	127
Unrealized Losses, Greater than 12 months	396	580
Unrealized Losses	$ 449	$ 707
U.S. government securities
Number of Securities
Number of Securities, Less than 12 months | security	46	266
Number of Securities, Greater than 12 months | security	92	155
Number of Securities | security	138	421
Fair Value
Fair Value, Less than 12 months	$ 111	$ 1,053
Fair Value, Greater than 12 months	189	394
Fair Value	300	1,447
Unrealized Losses
Unrealized Losses, Less than 12 months	4	18
Unrealized Losses, Greater than 12 months	7	20
Unrealized Losses	$ 11	$ 38
States, municipalities and political subdivisions
Number of Securities
Number of Securities, Less than 12 months | security	40	100
Number of Securities, Greater than 12 months | security	95	137
Number of Securities | security	135	237
Fair Value
Fair Value, Less than 12 months	$ 86	$ 181
Fair Value, Greater than 12 months	140	201
Fair Value	226	382
Unrealized Losses
Unrealized Losses, Less than 12 months	3	3
Unrealized Losses, Greater than 12 months	9	15
Unrealized Losses	$ 12	$ 18
U.S. corporate securities
Number of Securities
Number of Securities, Less than 12 months | security	911	3,119
Number of Securities, Greater than 12 months | security	1,931	2,602
Number of Securities | security	2,842	5,721
Fair Value
Fair Value, Less than 12 months	$ 1,217	$ 4,144
Fair Value, Greater than 12 months	2,553	3,395
Fair Value	3,770	7,539
Unrealized Losses
Unrealized Losses, Less than 12 months	32	64
Unrealized Losses, Greater than 12 months	251	348
Unrealized Losses	$ 283	$ 412
Foreign securities
Number of Securities
Number of Securities, Less than 12 months | security	266	599
Number of Securities, Greater than 12 months | security	433	616
Number of Securities | security	699	1,215
Fair Value
Fair Value, Less than 12 months	$ 423	$ 810
Fair Value, Greater than 12 months	622	874
Fair Value	1,045	1,684
Unrealized Losses
Unrealized Losses, Less than 12 months	9	21
Unrealized Losses, Greater than 12 months	49	90
Unrealized Losses	$ 58	$ 111
Residential mortgage-backed securities
Number of Securities
Number of Securities, Less than 12 months | security	53	89
Number of Securities, Greater than 12 months | security	328	361
Number of Securities | security	381	450
Fair Value
Fair Value, Less than 12 months	$ 158	$ 267
Fair Value, Greater than 12 months	303	342
Fair Value	461	609
Unrealized Losses
Unrealized Losses, Less than 12 months	1	5
Unrealized Losses, Greater than 12 months	39	49
Unrealized Losses	$ 40	$ 54
Commercial mortgage-backed securities
Number of Securities
Number of Securities, Less than 12 months | security	77	186
Number of Securities, Greater than 12 months | security	144	237
Number of Securities | security	221	423
Fair Value
Fair Value, Less than 12 months	$ 243	$ 628
Fair Value, Greater than 12 months	286	464
Fair Value	529	1,092
Unrealized Losses
Unrealized Losses, Less than 12 months	2	11
Unrealized Losses, Greater than 12 months	39	56
Unrealized Losses	$ 41	$ 67
Other asset-backed securities
Number of Securities
Number of Securities, Less than 12 months | security	135	139
Number of Securities, Greater than 12 months | security	41	62
Number of Securities | security	176	201
Fair Value
Fair Value, Less than 12 months	$ 272	$ 414
Fair Value, Greater than 12 months	38	58
Fair Value	310	472
Unrealized Losses
Unrealized Losses, Less than 12 months	2	5
Unrealized Losses, Greater than 12 months	2	2
Unrealized Losses	$ 4	$ 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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