Investments (Changes In Allowance For Credit Losses Of AFS) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period	$ 21	$ 0
Additions for securities for which credit losses were not previously recognized	5	41
Additions from purchases of PCD debt securities
Additions (reductions) for securities for which credit losses were previously recognized	(4)	(4)
Reductions for securities disposed		(15)
Reductions for securities charged-off	(10)	(10)
Balance as of end-of-period	12	12
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	19
Additions for securities for which credit losses were not previously recognized	5	39
Additions from purchases of PCD debt securities
Additions (reductions) for securities for which credit losses were previously recognized	(3)	(3)
Reductions for securities disposed		(15)
Reductions for securities charged-off	(10)	(10)
Balance as of end-of-period	11	11
RMBS [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period	1
Additions for securities for which credit losses were not previously recognized		1
Additions from purchases of PCD debt securities
Additions (reductions) for securities for which credit losses were previously recognized
Reductions for securities disposed
Reductions for securities charged-off
Balance as of end-of-period	1	1
ABS [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period	1
Additions for securities for which credit losses were not previously recognized		1
Additions from purchases of PCD debt securities
Additions (reductions) for securities for which credit losses were previously recognized	(1)	(1)
Reductions for securities disposed
Reductions for securities charged-off
Balance as of end-of-period