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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed maturity securities - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 37,868 | $ 10,644
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3,021 | 2,640
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 643 | 171
Debt Securities, Available-for-sale, Unrealized Loss Position | 40,889 | 13,284
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 5,119 | 347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,476 | 176
Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,494 | 599
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 237 | 185
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 77 | 67
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,731 | 784
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 254 | 87
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 177 | 20
Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 36,374 | 10,045
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,784 | 2,455
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 566 | 104
Debt Securities, Available-for-sale, Unrealized Loss Position | 39,158 | 12,500
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4,865 | 260
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,299 | 156
Corporate Debt Securities [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,234 | 463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 103 | 97
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 25 | 44
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,337 | 560
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 162 | 57
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 137 | 13
Corporate Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 25,035 | 4,135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,124 | 946
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 327 | 51
Debt Securities, Available-for-sale, Unrealized Loss Position | 26,159 | 5,081
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3,497 | 137
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,170 | 86
Canadian and Canadian provincial governments | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 359 | 20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 13 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 372 | 20
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 35 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 29 | 1
Residential mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 631 | 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 122 | 102
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 23 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position | 753 | 234
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 62 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 39 | 3
Asset-backed securities | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 61 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 8 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 13
Debt Securities, Available-for-sale, Unrealized Loss Position | 69 | 13
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 11 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9 | 0
Asset-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,850 | 1,747
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 640 | 589
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 45 | 6
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,490 | 2,336
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 289 | 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 244 | 22
Commercial mortgage-backed securities | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 29 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 40 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 4 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 0
Commercial mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,523 | 152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 39 | 35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,562 | 187
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 115 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 111 | 2
US Government Agencies Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 839 | 1,513
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 24 | 31
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 9 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position | 863 | 1,544
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 146 | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 137 | 6
US States and Political Subdivisions Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 789 | 109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 27 | 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position | 816 | 137
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 107 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 100 | 3
Debt Security, Government, Non-US [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 170 | 136
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 115 | 75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 49 | 10
Debt Securities, Available-for-sale, Unrealized Loss Position | 285 | 211
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 77 | 17
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 28 | 7
Debt Security, Government, Non-US [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4,348 | 2,237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 795 | 724
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 145 | 37
Debt Securities, Available-for-sale, Unrealized Loss Position | 5,143 | 2,961
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 614 | 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 469 | $ 33

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