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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed Maturities [Member] - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | $ 16,827 | $ 3,979
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,356 | 84
Estimated Fair Value - 12 months or greater | 805 | 1,238
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 105 | 26
Estimated Fair Value | 17,632 | 5,217
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,461 | 110
Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 1,294 | 220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 244 | 38
Estimated Fair Value - 12 months or greater | 73 | 110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 13 | 8
Estimated Fair Value | 1,367 | 330
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 257 | 46
Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 15,533 | 3,759
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,112 | 46
Estimated Fair Value - 12 months or greater | 732 | 1,128
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 92 | 18
Estimated Fair Value | 16,265 | 4,887
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1,204 | 64
Corporate Debt Securities [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 1,106 | 220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 219 | 38
Estimated Fair Value - 12 months or greater | 66 | 100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 11 | 7
Estimated Fair Value | 1,172 | 320
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 230 | 45
Corporate Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 9,666 | 1,936
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 729 | 29
Estimated Fair Value - 12 months or greater | 93 | 293
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 18 | 7
Estimated Fair Value | 9,759 | 2,229
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 747 | 36
Canadian and Canadian provincial governments | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Estimated Fair Value - 12 months or greater | 6 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 0
Estimated Fair Value | 6 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 1 | 0
Residential mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 1,047 | 367
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 25 | 2
Estimated Fair Value - 12 months or greater | 41 | 84
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 1
Estimated Fair Value | 1,088 | 451
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 27 | 3
Asset-backed Securities [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 15 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9 | 0
Estimated Fair Value - 12 months or greater | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Estimated Fair Value | 15 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 9 | 0
Asset-backed Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 1,936 | 773
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 203 | 5
Estimated Fair Value - 12 months or greater | 552 | 739
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 65 | 9
Estimated Fair Value | 2,488 | 1,512
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 268 | 14
Commercial mortgage-backed securities | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 23 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 |
Estimated Fair Value - 12 months or greater | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Estimated Fair Value | 23 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3 |
Commercial mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 913 | 253
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 52 | 3
Estimated Fair Value - 12 months or greater | 21 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 0
Estimated Fair Value | 934 | 253
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 53 | 3
US Government Agencies Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 0 | 49
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 1
Estimated Fair Value - 12 months or greater | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Estimated Fair Value | 0 | 49
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0 | 1
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] |  |
Estimated Fair Value - Less than 12 months | 158 | 103
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9 | 2
Estimated Fair Value - 12 months or greater | 12 | 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1 | 1
Estimated Fair Value | 170 | 115
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 10 | 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] |  |
Estimated Fair Value - Less than 12 months | 150 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13 | 0
Estimated Fair Value - 12 months or greater | 7 | 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 1
Estimated Fair Value | 157 | 10
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 15 | 1
Debt Security, Government, Non-US [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 1,813 | 278
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 94 | 4
Estimated Fair Value - 12 months or greater | 7 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4 | 0
Estimated Fair Value | 1,820 | 278
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 98 | $ 4

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