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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed maturities - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | $ 41,071 | $ 19,718
Less Than Twelve Months, Gross Unrealized Losses | 1,788 | 486
Twelve Months or More, Fair Value | 7,859 | 9,605
Twelve Months or More, Gross Unrealized Losses | 543 | 463
Total, Fair Value | 48,930 | 29,323
Total, Gross Unrealized Losses | 2,331 | 949
U.S. Treasury securities and obligations of U.S. government authorities and agencies |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 3,972 | 750
Less Than Twelve Months, Gross Unrealized Losses | 262 | 17
Twelve Months or More, Fair Value | 1 | 0
Twelve Months or More, Gross Unrealized Losses | 0 | 0
Total, Fair Value | 3,973 | 750
Total, Gross Unrealized Losses | 262 | 17
Obligations of U.S. states and their political subdivisions |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 541 | 73
Less Than Twelve Months, Gross Unrealized Losses | 27 | 1
Twelve Months or More, Fair Value | 0 | 0
Twelve Months or More, Gross Unrealized Losses | 0 | 0
Total, Fair Value | 541 | 73
Total, Gross Unrealized Losses | 27 | 1
Foreign government bonds |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 7,459 | 6,536
Less Than Twelve Months, Gross Unrealized Losses | 208 | 231
Twelve Months or More, Fair Value | 1,560 | 39
Twelve Months or More, Gross Unrealized Losses | 130 | 8
Total, Fair Value | 9,019 | 6,575
Total, Gross Unrealized Losses | 338 | 239
U.S. public corporate securities |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 14,295 | 3,905
Less Than Twelve Months, Gross Unrealized Losses | 805 | 87
Twelve Months or More, Fair Value | 996 | 1,197
Twelve Months or More, Gross Unrealized Losses | 81 | 106
Total, Fair Value | 15,291 | 5,102
Total, Gross Unrealized Losses | 886 | 193
U.S. private corporate securities |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 4,970 | 1,712
Less Than Twelve Months, Gross Unrealized Losses | 217 | 52
Twelve Months or More, Fair Value | 913 | 843
Twelve Months or More, Gross Unrealized Losses | 68 | 82
Total, Fair Value | 5,883 | 2,555
Total, Gross Unrealized Losses | 285 | 134
Foreign public corporate securities |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 2,967 | 1,412
Less Than Twelve Months, Gross Unrealized Losses | 93 | 30
Twelve Months or More, Fair Value | 822 | 376
Twelve Months or More, Gross Unrealized Losses | 40 | 23
Total, Fair Value | 3,789 | 1,788
Total, Gross Unrealized Losses | 133 | 53
Foreign private corporate securities |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 3,676 | 798
Less Than Twelve Months, Gross Unrealized Losses | 118 | 34
Twelve Months or More, Fair Value | 1,965 | 2,371
Twelve Months or More, Gross Unrealized Losses | 210 | 192
Total, Fair Value | 5,641 | 3,169
Total, Gross Unrealized Losses | 328 | 226
Asset-backed securities |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 1,536 | 4,132
Less Than Twelve Months, Gross Unrealized Losses | 8 | 25
Twelve Months or More, Fair Value | 1,451 | 4,685
Twelve Months or More, Gross Unrealized Losses | 6 | 49
Total, Fair Value | 2,987 | 8,817
Total, Gross Unrealized Losses | 14 | 74
Commercial mortgage-backed securities |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 1,048 | 284
Less Than Twelve Months, Gross Unrealized Losses | 34 | 8
Twelve Months or More, Fair Value | 139 | 93
Twelve Months or More, Gross Unrealized Losses | 8 | 3
Total, Fair Value | 1,187 | 377
Total, Gross Unrealized Losses | 42 | 11
Residential mortgage-backed securities |  |
Debt Securities [Line Items] |  |
Less Than Twelve Months, Fair Value | 607 | 116
Less Than Twelve Months, Gross Unrealized Losses | 16 | 1
Twelve Months or More, Fair Value | 12 | 1
Twelve Months or More, Gross Unrealized Losses | 0 | 0
Total, Fair Value | 619 | 117
Total, Gross Unrealized Losses | $ 16 | $ 1

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