Investments - Unrealized Capital Losses (Details) $ in Millions | 12 Months Ended | |
Dec. 31, 2022 USD ($) securities | Dec. 31, 2021 USD ($) 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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 72 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 3,153 | 989 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 708 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 861 | $ 39 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 1,069 | 337 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 18,531 | $ 4,546 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,628 | $ 111 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 4,222 | 1,326 |
Available For Sale Securities Change in Loss Position | $ 2,517 | |
More Than Twelve Months Below Amortized Cost, Fair Value | 3,143 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 15,388 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,767 | |
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 18 | 4 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 7 |
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 | 3 | 2 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 225 | $ 14 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 31 | $ 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 21 | 6 |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 2 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 223 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 30 | |
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 1 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 276 | 21 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 7 | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 16 | 0 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 560 | $ 33 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 92 | $ 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 292 | 21 |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 15 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 545 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 85 | |
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 32 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 901 | 290 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 110 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 419 | $ 7 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 360 | 138 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 5,288 | $ 1,347 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,032 | $ 39 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 1,261 | 428 |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 998 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 4,290 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 613 | |
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 2 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 312 | 35 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 94 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 64 | $ 13 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 32 | 8 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 3,150 | $ 419 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 328 | $ 15 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 344 | 43 |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 331 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 2,819 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 264 | |
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 13 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 348 | 90 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 21 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 116 | $ 1 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 93 | 17 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 1,807 | $ 446 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 317 | $ 14 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 441 | 107 |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 298 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 1,509 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 201 | |
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 1 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 200 | 7 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 10 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 11 | $ 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 6 | 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 2,255 | $ 64 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 184 | $ 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 206 | 8 |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 52 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 2,203 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 173 | |
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 11 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 441 | 181 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 241 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 75 | $ 9 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 215 | 96 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 1,393 | $ 641 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 153 | $ 20 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 656 | 277 |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 328 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 1,065 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 78 | |
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 8 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 373 | 178 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 155 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 127 | $ 7 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 189 | 27 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 2,551 | $ 935 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 379 | $ 15 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 562 | 205 |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 759 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 1,792 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 252 | |
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 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | | $ 4 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 281 | 183 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | | $ 70 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 41 | $ 2 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 155 | 48 |
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 1,272 | $ 647 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 109 | $ 6 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 436 | 231 |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 360 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 912 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 68 | |
U.S. Government agencies and authorities | | |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] | | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | securities | 3 | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 | |
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 | $ 30 | |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 3 | |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities | 3 | |
More Than Twelve Months Below Amortized Cost, Fair Value | $ 0 | |
Debt Securities, Available-for-sale, Including Securities Pledged, Continuous Unrealized Loss Position Twelve Months or Less, Fair Value | 30 | |
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | |
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 | $ 6 | |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | securities | 9 | |