Investments - Unrealized Capital Losses (Details) $ in Millions | Jun. 30, 2022 USD ($) securities | Dec. 31, 2021 USD ($) securities |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 3,326 | 989 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,847 | $ 111 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 1,613 | $ 72 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 3,823 | 1,326 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 497 | 337 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 1,099 | $ 708 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 16,176 | 3,838 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 234 | 39 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 17,275 | $ 4,546 |
U.S. Treasuries | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 11 | 4 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 14 | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 14 | $ 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 14 | 6 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 3 | 2 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 8 | $ 7 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 82 | 7 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 90 | $ 14 |
State, municipalities and political subdivisions | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 250 | 21 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 47 | $ 1 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 47 | $ 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 250 | 21 |
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 | $ 0 | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 519 | 33 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 519 | $ 33 |
U.S. corporate public securities | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 978 | 290 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 776 | $ 39 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 656 | $ 32 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 1,165 | 428 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 187 | 138 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 323 | $ 110 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 4,598 | 1,237 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 120 | 7 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 4,921 | $ 1,347 |
U.S. corporate private securities | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 309 | 35 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 231 | $ 15 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 213 | $ 2 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 317 | 43 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 8 | 8 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 81 | $ 94 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 2,702 | 325 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 18 | 13 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 2,783 | $ 419 |
Foreign corporate public securities and foreign governments | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 364 | 90 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 244 | $ 14 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 202 | $ 13 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 408 | 107 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 44 | 17 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 129 | $ 21 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 1,504 | 425 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 42 | 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 1,633 | $ 446 |
Foreign corporate private securities | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 186 | 7 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 136 | $ 1 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 134 | $ 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 189 | 8 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 3 | 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 11 | $ 10 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 1,990 | 54 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2 | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 2,001 | $ 64 |
Residential mortgage-backed | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 391 | 181 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 107 | $ 20 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 84 | $ 11 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 540 | 277 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 149 | 96 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 281 | $ 241 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 1,279 | 400 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 23 | 9 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 1,560 | $ 641 |
Commercial mortgage-backed | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 486 | 178 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 200 | $ 15 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 181 | $ 8 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 524 | 205 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 38 | 27 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 168 | $ 155 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 2,344 | 780 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 19 | 7 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 2,512 | $ 935 |
Other asset-backed securities | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 349 | 183 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 90 | $ 6 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 80 | $ 4 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 414 | 231 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 65 | 48 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 98 | $ 70 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 1,140 | 577 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 10 | 2 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 1,238 | $ 647 |
US Government Corporations and Agencies Securities | | |
Available-for-sale Securities Including Securities Pledged [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 2 | |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2 | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 2 | |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 2 | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 0 | |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 0 | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 18 | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | $ 18 | |