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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | $ 25,154 | $ 166,950
Less than Twelve Months, Unrealized Losses | 1,015 | 20,276
Twelve Months or More, Fair Value | 173,006 | 54,318
Twelve Months or More, Unrealized Losses | 26,855 | 15,668
Fair Value | 198,160 | 221,268
Unrealized Losses | 27,870 | 35,944
U.S. Treasury securities and obligations of U.S. government authorities and agencies |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 2,718 | 18,009
Less than Twelve Months, Unrealized Losses | 95 | 3,143
Twelve Months or More, Fair Value | 12,642 | 2,563
Twelve Months or More, Unrealized Losses | 4,074 | 1,270
Fair Value | 15,360 | 20,572
Unrealized Losses | 4,169 | 4,413
Obligations of U.S. states and their political subdivisions |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 862 | 5,510
Less than Twelve Months, Unrealized Losses | 14 | 526
Twelve Months or More, Fair Value | 3,816 | 558
Twelve Months or More, Unrealized Losses | 445 | 202
Fair Value | 4,678 | 6,068
Unrealized Losses | 459 | 728
Foreign government bonds |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 9,098 | 16,932
Less than Twelve Months, Unrealized Losses | 542 | 2,384
Twelve Months or More, Fair Value | 19,589 | 9,877
Twelve Months or More, Unrealized Losses | 4,664 | 2,971
Fair Value | 28,687 | 26,809
Unrealized Losses | 5,206 | 5,355
U.S. public corporate securities |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 4,881 | 58,816
Less than Twelve Months, Unrealized Losses | 103 | 7,790
Twelve Months or More, Fair Value | 61,204 | 15,780
Twelve Months or More, Unrealized Losses | 9,604 | 5,726
Fair Value | 66,085 | 74,596
Unrealized Losses | 9,707 | 13,516
U.S. private corporate securities |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 3,026 | 24,610
Less than Twelve Months, Unrealized Losses | 69 | 2,065
Twelve Months or More, Fair Value | 27,062 | 6,705
Twelve Months or More, Unrealized Losses | 2,504 | 1,373
Fair Value | 30,088 | 31,315
Unrealized Losses | 2,573 | 3,438
Foreign public corporate securities |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 1,766 | 10,168
Less than Twelve Months, Unrealized Losses | 37 | 932
Twelve Months or More, Fair Value | 10,812 | 4,098
Twelve Months or More, Unrealized Losses | 1,246 | 993
Fair Value | 12,578 | 14,266
Unrealized Losses | 1,283 | 1,925
Foreign private corporate securities |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 1,578 | 16,909
Less than Twelve Months, Unrealized Losses | 120 | 2,521
Twelve Months or More, Fair Value | 22,145 | 8,196
Twelve Months or More, Unrealized Losses | 3,324 | 2,678
Fair Value | 23,723 | 25,105
Unrealized Losses | 3,444 | 5,199
Asset-backed securities |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 846 | 5,385
Less than Twelve Months, Unrealized Losses | 30 | 130
Twelve Months or More, Fair Value | 5,886 | 5,059
Twelve Months or More, Unrealized Losses | 89 | 156
Fair Value | 6,732 | 10,444
Unrealized Losses | 119 | 286
Commercial mortgage-backed securities |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 287 | 9,289
Less than Twelve Months, Unrealized Losses | 3 | 655
Twelve Months or More, Fair Value | 8,251 | 1,080
Twelve Months or More, Unrealized Losses | 710 | 206
Fair Value | 8,538 | 10,369
Unrealized Losses | 713 | 861
Residential mortgage-backed securities |  |
Debt Securities[Line Items] |  |
Less than Twelve Months, Fair Value | 92 | 1,322
Less than Twelve Months, Unrealized Losses | 2 | 130
Twelve Months or More, Fair Value | 1,599 | 402
Twelve Months or More, Unrealized Losses | 195 | 93
Fair Value | 1,691 | 1,724
Unrealized Losses | $ 197 | $ 223

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