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Investments (Credit Losses Recognized In Earnings on Fixed Maturity Securities Held by the Company) (Details) - Fixed maturities - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Available-for-sale |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | $ 133 | $ 0
Additions to allowance for credit losses not previously recorded | 31 | 158
Reductions for securities sold during the period | (26) |
Additions (reductions) on securities with previous allowance | (7) |
Balance, ending of period | 131 | 158
Available-for-sale | U.S. Treasury securities and obligations of U.S. government authorities and agencies |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 0 | 0
Additions to allowance for credit losses not previously recorded | 0 | 0
Reductions for securities sold during the period | 0 |
Additions (reductions) on securities with previous allowance | 0 |
Balance, ending of period | 0 | 0
Available-for-sale | Foreign government bonds |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 0 | 0
Additions to allowance for credit losses not previously recorded | 0 | 38
Reductions for securities sold during the period | 0 |
Additions (reductions) on securities with previous allowance | 0 |
Balance, ending of period | 0 | 38
Available-for-sale | U.S. and Foreign Corporate Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 123 | 0
Additions to allowance for credit losses not previously recorded | 31 | 119
Reductions for securities sold during the period | (26) |
Additions (reductions) on securities with previous allowance | (6) |
Balance, ending of period | 122 | 119
Available-for-sale | Asset-backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 0 | 0
Additions to allowance for credit losses not previously recorded | 0 | 0
Reductions for securities sold during the period | 0 |
Additions (reductions) on securities with previous allowance | 0 |
Balance, ending of period | 0 | 0
Available-for-sale | Commercial mortgage-backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 10 | 0
Additions to allowance for credit losses not previously recorded | 0 | 1
Reductions for securities sold during the period | 0 |
Additions (reductions) on securities with previous allowance | (1) |
Balance, ending of period | 9 | 1
Available-for-sale | Residential mortgage-backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 0 | 0
Additions to allowance for credit losses not previously recorded | 0 | 0
Reductions for securities sold during the period | 0 |
Additions (reductions) on securities with previous allowance | 0 |
Balance, ending of period | 0 | 0
Held-to-maturity |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 9 | 0
Cumulative effect of adoption of ASU 2016-13 |  | 9
Additions (reductions) on securities with previous allowance | (2) |
Balance, ending of period | 7 | 9
Held-to-maturity | U.S. Treasury securities and obligations of U.S. government authorities and agencies |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 0 | 0
Cumulative effect of adoption of ASU 2016-13 |  | 0
Additions (reductions) on securities with previous allowance | 0 |
Balance, ending of period | 0 | 0
Held-to-maturity | Foreign government bonds |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 0 | 0
Cumulative effect of adoption of ASU 2016-13 |  | 0
Additions (reductions) on securities with previous allowance | 0 |
Balance, ending of period | 0 | 0
Held-to-maturity | U.S. and Foreign Corporate Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 9 | 0
Cumulative effect of adoption of ASU 2016-13 |  | 9
Additions (reductions) on securities with previous allowance | (2) |
Balance, ending of period | 7 | 9
Held-to-maturity | Asset-backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 0 | 0
Cumulative effect of adoption of ASU 2016-13 |  | 0
Additions (reductions) on securities with previous allowance | 0 |
Balance, ending of period | 0 | 0
Held-to-maturity | Commercial mortgage-backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 0 | 0
Cumulative effect of adoption of ASU 2016-13 |  | 0
Additions (reductions) on securities with previous allowance | 0 |
Balance, ending of period | 0 | 0
Held-to-maturity | Residential mortgage-backed securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Balance, beginning of period | 0 | 0
Cumulative effect of adoption of ASU 2016-13 |  | 0
Additions (reductions) on securities with previous allowance | 0 |
Balance, ending of period | $ 0 | $ 0

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