Investments - Unrealized Capital Losses (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) securities	Dec. 31, 2020 USD ($) securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,838	$ 2,134
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 72	$ 78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	989	555
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 708	$ 519
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 39	$ 29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	337	163
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 4,546	$ 2,653
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 111	$ 107
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	1,326	718
Available For Sale Securities Change in Loss Position	$ 4
U.S. Treasuries
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	7	$ 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	4	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 7	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	2	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 14	$ 8
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	6	2
State, municipalities and political subdivisions
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 33	$ 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	21	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 33	$ 5
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1	$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	21	2
U.S. corporate public securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,237	$ 199
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 32	$ 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	290	182
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 110	$ 22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 7	$ 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	138	4
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,347	$ 221
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 39	$ 7
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	428	186
U.S. corporate private securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 325	$ 316
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2	$ 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	35	29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 94	$ 71
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 13	$ 17
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	8	7
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 419	$ 387
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 15	$ 27
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	43	36
Foreign corporate public securities and foreign governments
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 425	$ 32
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 13	$ 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	90	22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 21	$ 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	17	2
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 446	$ 38
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 14	$ 1
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	107	24
Foreign corporate private securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 54	$ 176
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	7	20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 10	$ 3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	1	1
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 64	$ 179
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1	$ 25
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	8	21
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 400	$ 613
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 11	$ 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	181	134
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 241	$ 119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 9	$ 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	96	54
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 641	$ 732
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 20	$ 15
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	277	188
Commercial mortgage-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 780	$ 579
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 8	$ 25
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	178	105
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 155	$ 33
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 7	$ 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	27	7
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 935	$ 612
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 15	$ 26
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	205	112
Other asset-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 577	$ 206
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 4	$ 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions \| securities	183	59
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 70	$ 265
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2	$ 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	48	88
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 647	$ 471
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 6	$ 6
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| securities	231	147
Fair value decline below amortized cost greater than 20%
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions \| securities	4

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