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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
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