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Investments (Changes In Allowance For Credit Losses On AFS) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]  
Balance as of beginning-of-year $ 0
Balance as of end of-year 13
Accrued interest receivable on fixed maturity AFS securities 1,000
Fixed Maturity AFS Securities [Member]  
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]  
Additions for securities for which credit losses were not previously recognized 45
Additions (reductions) for securities for which credit losses were previously recognized (2)
Reductions for securities disposed (17)
Reductions for securities charged-off (13)
Balance as of end of-year 13
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]  
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]  
Additions for securities for which credit losses were not previously recognized 43
Additions (reductions) for securities for which credit losses were previously recognized (1)
Reductions for securities disposed (17)
Reductions for securities charged-off (13)
Balance as of end of-year 12
Fixed Maturity AFS Securities [Member] | 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
Balance as of end of-year 1
Fixed Maturity AFS Securities [Member] | 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
Additions (reductions) for securities for which credit losses were previously recognized $ (1)