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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.

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