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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, 2021 | Dec. 31, 2020
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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 | $ 6,118 | $ 4,068
Gross Unrealized Losses - Less than 12 months | 199 | 163
Estimated Fair Value - 12 months or greater | 1,799 | 769
Gross Unrealized Losses - 12 months or greater | 68 | 34
Estimated Fair Value | 7,917 | 4,837
Gross Unrealized Losses | 267 | 197
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 | 348 | 522
Gross Unrealized Losses - Less than 12 months | 46 | 80
Estimated Fair Value - 12 months or greater | 242 | 113
Gross Unrealized Losses - 12 months or greater | 28 | 15
Estimated Fair Value | 590 | 635
Gross Unrealized Losses | 74 | 95
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 | 5,770 | 3,546
Gross Unrealized Losses - Less than 12 months | 153 | 83
Estimated Fair Value - 12 months or greater | 1,557 | 656
Gross Unrealized Losses - 12 months or greater | 40 | 19
Estimated Fair Value | 7,327 | 4,202
Gross Unrealized Losses | 193 | 102
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 | 258 | 375
Gross Unrealized Losses - Less than 12 months | 42 | 49
Estimated Fair Value - 12 months or greater | 168 | 81
Gross Unrealized Losses - 12 months or greater | 10 | 11
Estimated Fair Value | 426 | 456
Gross Unrealized Losses | 52 | 60
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 | 2,596 | 930
Gross Unrealized Losses - Less than 12 months | 79 | 29
Estimated Fair Value - 12 months or greater | 168 | 70
Gross Unrealized Losses - 12 months or greater | 6 | 5
Estimated Fair Value | 2,764 | 1,000
Gross Unrealized Losses | 85 | 34
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 | 261 | 294
Gross Unrealized Losses - Less than 12 months | 5 | 2
Estimated Fair Value - 12 months or greater | 21 | 0
Gross Unrealized Losses - 12 months or greater | 1 | 0
Estimated Fair Value | 282 | 294
Gross Unrealized Losses | 6 | 2
Asset-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 | 24 | 20
Gross Unrealized Losses - Less than 12 months | 1 | 13
Estimated Fair Value - 12 months or greater | 15 | 4
Gross Unrealized Losses - 12 months or greater | 11 | 1
Estimated Fair Value | 39 | 24
Gross Unrealized Losses | 12 | 14
Asset-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 | 800 | 1,096
Gross Unrealized Losses - Less than 12 months | 4 | 17
Estimated Fair Value - 12 months or greater | 754 | 570
Gross Unrealized Losses - 12 months or greater | 5 | 11
Estimated Fair Value | 1,554 | 1,666
Gross Unrealized Losses | 9 | 28
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 | 0 | 91
Gross Unrealized Losses - Less than 12 months | 0 | 15
Estimated Fair Value - 12 months or greater | 43 | 0
Gross Unrealized Losses - 12 months or greater | 5 | 0
Estimated Fair Value | 43 | 91
Gross Unrealized Losses | 5 | 15
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 | 0 | 160
Gross Unrealized Losses - Less than 12 months | 0 | 6
Estimated Fair Value - 12 months or greater | 24 | 0
Gross Unrealized Losses - 12 months or greater | 1 | 0
Estimated Fair Value | 24 | 160
Gross Unrealized Losses | 1 | 6
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 | 364 | 27
Gross Unrealized Losses - Less than 12 months | 24 | 1
Estimated Fair Value - 12 months or greater | 0 | 0
Gross Unrealized Losses - 12 months or greater | 0 | 0
Estimated Fair Value | 364 | 27
Gross Unrealized Losses | 24 | 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 | 95 | 66
Gross Unrealized Losses - Less than 12 months | 2 | 1
Estimated Fair Value - 12 months or greater | 29 | 16
Gross Unrealized Losses - 12 months or greater | 4 | 3
Estimated Fair Value | 124 | 82
Gross Unrealized Losses | 6 | 4
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 | 66 | 36
Gross Unrealized Losses - Less than 12 months | 3 | 3
Estimated Fair Value - 12 months or greater | 16 | 28
Gross Unrealized Losses - 12 months or greater | 2 | 3
Estimated Fair Value | 82 | 64
Gross Unrealized Losses | 5 | 6
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 | 1,630 | 973
Gross Unrealized Losses - Less than 12 months | 37 | 27
Estimated Fair Value - 12 months or greater | 561 | 0
Gross Unrealized Losses - 12 months or greater | 23 | 0
Estimated Fair Value | 2,191 | 973
Gross Unrealized Losses | $ 60 | $ 27

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