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Investments (Summary Of Amortized Cost, Allowance For Credit Losses, Gross Unrealized Appreciation/(Depreciation) And Fair Value Of Fixed Maturity Securities) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fixed maturity securities - available for sale: |  |
Amortized Cost | $ 23,204 | $ 22,064
Allowance for credit losses | (38) | (30)
Fair Value | 21,009 | 22,308
Fixed maturity securities - held to maturity: |  |
Allowance for credit losses | (9) |
Fair Value | 817 |
Fixed Maturity Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 23,204 | 22,064
Allowance for credit losses | (38) | (30)
Unrealized Appreciation | 153 | 478
Unrealized Depreciation | (2,310) | (203)
Fair Value | 21,009 | 22,308
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 846 |
Allowance for credit losses | (9) |
Unrealized Appreciation | 1 |
Unrealized Depreciation | (21) |
Fair Value | 817 |
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 1,367 | 1,407
Allowance for credit losses |  |
Unrealized Appreciation | 19 | 24
Unrealized Depreciation | (79) | (10)
Fair Value | 1,308 | 1,421
Obligations Of U.S. States And Political Subdivisions [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 519 | 559
Allowance for credit losses |  |
Unrealized Appreciation | 1 | 29
Unrealized Depreciation | (38) | (1)
Fair Value | 481 | 587
Corporate Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 7,010 | 7,444
Allowance for credit losses | (29) | (19)
Unrealized Appreciation | 69 | 195
Unrealized Depreciation | (653) | (63)
Fair Value | 6,397 | 7,557
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 160 |
Allowance for credit losses | (2) |
Unrealized Appreciation |  |
Unrealized Depreciation | (11) |
Fair Value | 147 |
Asset-Backed Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 3,935 | 3,579
Allowance for credit losses |  | (8)
Unrealized Appreciation | 1 | 22
Unrealized Depreciation | (164) | (12)
Fair Value | 3,772 | 3,582
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 653 |
Allowance for credit losses | (6) |
Unrealized Appreciation | 1 |
Unrealized Depreciation | (10) |
Fair Value | 639 |
Mortgage-Backed Securities: Commercial [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 1,016 | 1,033
Allowance for credit losses |  |
Unrealized Appreciation |  | 38
Unrealized Depreciation | (108) | (6)
Fair Value | 908 | 1,064
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 6 |
Allowance for credit losses |  |
Unrealized Appreciation |  |
Unrealized Depreciation |  |
Fair Value | 6 |
Mortgage Backed Securities: Agency residential [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 3,058 | 2,361
Allowance for credit losses |  |
Unrealized Appreciation | 2 | 33
Unrealized Depreciation | (337) | (19)
Fair Value | 2,723 | 2,375
Mortgage Backed Securities: Non-agency residential [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 5 | 7
Allowance for credit losses |  |
Unrealized Appreciation |  |
Unrealized Depreciation |  |
Fair Value | 5 | 7
Foreign Government Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 1,528 | 1,424
Allowance for credit losses |  |
Unrealized Appreciation | 13 | 42
Unrealized Depreciation | (205) | (28)
Fair Value | 1,335 | 1,438
Foreign Corporate Securities [Member] |  |
Fixed maturity securities - available for sale: |  |
Amortized Cost | 4,768 | 4,251
Allowance for credit losses | (9) | (3)
Unrealized Appreciation | 47 | 95
Unrealized Depreciation | (726) | (65)
Fair Value | 4,080 | $ 4,279
Fixed maturity securities - held to maturity: |  |
Amortized Cost | 28 |
Allowance for credit losses | (1) |
Unrealized Appreciation |  |
Unrealized Depreciation | (1) |
Fair Value | $ 26 |

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