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Investments (Changes In Allowance For Credit Losses On AFS) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Balance as of beginning-of-period | $ 20 | $ 0
Additions for securities for which credit losses were not previously recognized | 19 | 39
Reductions for securities disposed | (17) | (17)
Balance as of end of-period | 22 | 22
Accrued interest receivable on fixed maturity AFS securities |  | 1,000
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Balance as of beginning-of-period | 20 |
Additions for securities for which credit losses were not previously recognized | 17 | 37
Reductions for securities disposed | (17) | (17)
Balance as of end of-period | 20 | 20
RMBS [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Additions for securities for which credit losses were not previously recognized | 1 | 1
Balance as of end of-period | 1 | 1
ABS [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Additions for securities for which credit losses were not previously recognized | 1 | 1
Balance as of end of-period | $ 1 | $ 1

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