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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 | Sep. 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 | $ 37,134 | $ 10,644
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,378 | 2,640
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,444 | 171
Debt Securities, Available-for-sale, Unrealized Loss Position | 42,512 | 13,284
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 7,776 | 347
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,332 | 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 | 1,405 | 599
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 367 | 185
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 134 | 67
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,772 | 784
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 295 | 87
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 161 | 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 | 35,729 | 10,045
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 5,011 | 2,455
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,310 | 104
Debt Securities, Available-for-sale, Unrealized Loss Position | 40,740 | 12,500
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 7,481 | 260
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6,171 | 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 | 1,144 | 463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 202 | 97
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 62 | 44
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,346 | 560
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 180 | 57
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 118 | 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 | 25,451 | 4,135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,283 | 946
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 811 | 51
Debt Securities, Available-for-sale, Unrealized Loss Position | 27,734 | 5,081
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 5,572 | 137
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4,761 | 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 | 368 | 20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 380 | 20
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 41 | 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 36 | 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 | 678 | 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 128 | 102
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 36 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position | 806 | 234
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 105 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 69 | 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 | 53 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 23 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7 | 13
Debt Securities, Available-for-sale, Unrealized Loss Position | 76 | 13
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 19 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 12 | 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 | 2,333 | 1,747
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,054 | 589
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 121 | 6
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,387 | 2,336
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 417 | 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 296 | 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 | 22 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 18 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 40 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 6 | 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 | 1,461 | 152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 83 | 35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 17 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,544 | 187
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 166 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 149 | 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 | 721 | 1,513
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 116 | 31
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 14 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position | 837 | 1,544
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 204 | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 190 | 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 | 883 | 109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 44 | 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 16 | 2
Debt Securities, Available-for-sale, Unrealized Loss Position | 927 | 137
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 177 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 161 | 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 | 186 | 136
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 124 | 75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 62 | 10
Debt Securities, Available-for-sale, Unrealized Loss Position | 310 | 211
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 90 | 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 | 3,834 | 2,237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,291 | 724
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 290 | 37
Debt Securities, Available-for-sale, Unrealized Loss Position | 5,125 | 2,961
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 799 | 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 509 | $ 33

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