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Investments (Fixed Maturities Securities Excluding Investments Classified as Trading) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost $ 341,122 $ 354,470
Allowance for Credit Losses 131 133
Fair Value [1] 378,596 412,905
Amortized Cost [1] 1,801 1,930
Fair Value 2,125 2,298
Allowance for Credit Losses 7 9
Fixed maturities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 341,122 354,470
Gross Unrealized Gains 39,950 59,548
Gross Unrealized Losses 2,345 980
Allowance for Credit Losses 131 133
Fair Value 378,596 412,905
Amortized Cost 1,808 1,939
Gross Unrealized Gains 317 359
Gross Unrealized Losses 0 0
Fair Value 2,125 2,298
Allowance for Credit Losses 7 9
Amortized Cost, Net of Allowance 1,801 1,930
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 23,400 30,766
Gross Unrealized Gains 4,490 9,699
Gross Unrealized Losses 262 17
Allowance for Credit Losses 0 0
Fair Value 27,628 40,448
Fixed maturities | Obligations of U.S. states and their political subdivisions    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 10,491 10,668
Gross Unrealized Gains 1,625 2,144
Gross Unrealized Losses 27 1
Allowance for Credit Losses 0 0
Fair Value 12,089 12,811
Fixed maturities | Foreign government bonds    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 89,084 94,110
Gross Unrealized Gains 13,738 16,373
Gross Unrealized Losses 338 239
Allowance for Credit Losses 0 0
Fair Value 102,484 110,244
Amortized Cost 872 935
Gross Unrealized Gains 239 270
Gross Unrealized Losses 0 0
Fair Value 1,111 1,205
Allowance for Credit Losses 0 0
Amortized Cost, Net of Allowance 872 935
Fixed maturities | U.S. public corporate securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 95,495 95,299
Gross Unrealized Gains 11,384 18,516
Gross Unrealized Losses 891 213
Allowance for Credit Losses 13 47
Fair Value 105,975 113,555
Fixed maturities | U.S. private corporate securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 36,904 36,894
Gross Unrealized Gains 2,776 4,196
Gross Unrealized Losses 286 134
Allowance for Credit Losses 46 19
Fair Value 39,348 40,937
Fixed maturities | Foreign public corporate securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 25,892 25,857
Gross Unrealized Gains 2,713 3,768
Gross Unrealized Losses 140 64
Allowance for Credit Losses 25 24
Fair Value 28,440 29,537
Amortized Cost 612 651
Gross Unrealized Gains 60 68
Gross Unrealized Losses 0 0
Fair Value 672 719
Allowance for Credit Losses 7 9
Amortized Cost, Net of Allowance 605 642
Fixed maturities | Foreign private corporate securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 28,772 28,668
Gross Unrealized Gains 2,074 3,183
Gross Unrealized Losses 329 226
Allowance for Credit Losses 38 33
Fair Value 30,479 31,592
Amortized Cost 82 87
Gross Unrealized Gains 1 1
Gross Unrealized Losses 0 0
Fair Value 83 88
Allowance for Credit Losses 0 0
Amortized Cost, Net of Allowance 82 87
Fixed maturities | Asset-backed securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 13,470 14,489
Gross Unrealized Gains 179 176
Gross Unrealized Losses 14 74
Allowance for Credit Losses 0 0
Fair Value 13,635 14,591
Fixed maturities | Commercial mortgage-backed securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 14,673 15,036
Gross Unrealized Gains 803 1,288
Gross Unrealized Losses 42 11
Allowance for Credit Losses 9 10
Fair Value 15,425 16,303
Fixed maturities | Residential mortgage-backed securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 2,941 2,683
Gross Unrealized Gains 168 205
Gross Unrealized Losses 16 1
Allowance for Credit Losses 0 0
Fair Value 3,093 2,887
Amortized Cost 242 266
Gross Unrealized Gains 17 20
Gross Unrealized Losses 0 0
Fair Value 259 286
Allowance for Credit Losses 0 0
Amortized Cost, Net of Allowance 242 266
Prudential Netting Agreement | Fixed maturities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 4,748 4,998
Fair Value 5,186 5,821
Prudential Netting Agreement | Fixed maturities | U.S. private corporate securities    
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]    
Amortized Cost 5,766 5,966
Fair Value $ 5,774 $ 6,100
[1] See Note 4 for details of balances associated with variable interest entities.