Investments (Changes In Allowance For Credit Losses On AFS) (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period	$ 13,000,000
Balance as of end-of-period	19,000,000	$ 13,000,000
Fixed Maturity AFS Securities [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period	13,000,000
Additions for securities for which credit losses were not previously recognized	9,000,000	45,000,000
Additions (reductions) for securities for which credit losses were previously recognized	5,000,000	(2,000,000)
Reductions for securities disposed	(2,000,000)	(17,000,000)
Reductions for securities charged-off	(6,000,000)	(13,000,000)
Balance as of end-of-period	19,000,000	13,000,000
Accrued interest receivable on fixed maturity AFS securities	972,000,000	1,000,000,000.0
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	12,000,000
Additions for securities for which credit losses were not previously recognized	8,000,000	43,000,000
Additions (reductions) for securities for which credit losses were previously recognized	5,000,000	(1,000,000)
Reductions for securities disposed	(2,000,000)	(17,000,000)
Reductions for securities charged-off	(6,000,000)	(13,000,000)
Balance as of end-of-period	17,000,000	12,000,000
Fixed Maturity AFS Securities [Member] \| RMBS [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Balance as of beginning-of-period	1,000,000
Additions for securities for which credit losses were not previously recognized		1,000,000
Balance as of end-of-period	1,000,000	1,000,000
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		1,000,000
Additions (reductions) for securities for which credit losses were previously recognized		$ (1,000,000)
Fixed Maturity AFS Securities [Member] \| Other [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Additions for securities for which credit losses were not previously recognized	1,000,000
Balance as of end-of-period	$ 1,000,000

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).

+ References

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
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-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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