Investments (Changes In Allowance For Credit Losses On AFS) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period			$ 13
Balance as of end-of-period	$ 17		17
Accrued interest receivable on fixed maturity AFS securities			1,100	$ 1,100
Fixed Maturity AFS Securities [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period	9	$ 22	13
Additions for securities for which credit losses were not previously recognized	8	5	8	44
Additions (reductions) for securities for which credit losses were previously recognized		(4)	2	(4)
Reductions for securities disposed				(17)
Reductions for securities charged-off		(11)	(6)	(11)
Balance as of end-of-period	17	12	17	12
Fixed Maturity AFS Securities [Member] \| Corporate Bonds [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period	8	20	12
Additions for securities for which credit losses were not previously recognized	8	5	8	42
Additions (reductions) for securities for which credit losses were previously recognized		(3)	2	(3)
Reductions for securities disposed				(17)
Reductions for securities charged-off		(11)	(6)	(11)
Balance as of end-of-period	16	11	16	11
Fixed Maturity AFS Securities [Member] \| RMBS [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period	1	1	1
Additions for securities for which credit losses were not previously recognized				1
Balance as of end-of-period	$ 1	1	$ 1	1
Fixed Maturity AFS Securities [Member] \| 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 (reductions) for securities for which credit losses were previously recognized		$ (1)		$ (1)

Amount of writeoff of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized by reversing interest income.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 3D
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL120267862-210455

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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