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Investmenst (Changes In Allowance For Credit Losses On Mortgage Loans On Real Estate) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Balance as of beginning-of-year	$ 2
Additions from provision for credit loss expense	188
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized	(74)
Balance as of end-of-year	204
Changes in economic assumptions increasing provision	114
Accrued interest receivable excluded from credit losses	49
Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance as of beginning-of-year	88
Unfunded Loan Commitment [Member]
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized	2
Commercial [Member]
Additions from provision for credit loss expense	178
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized	(53)
Balance as of end-of-year	187
Commercial [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance as of beginning-of-year	62
Residential [Member]
Balance as of beginning-of-year	2
Additions from provision for credit loss expense	10
Additions (reductions) for mortgage loans on real estate for which credit losses were previously recognized	(21)
Balance as of end-of-year	17
Residential [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance as of beginning-of-year	$ 26

X

- Definition

Amount, before allowance for credit loss, of accrued interest on financing receivable.

+ References

No definition available.

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Financing receivable, additions (reductions) on previously recognized provision

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- Definition

Amount of credit loss expense (reversal of expense) for financing receivable, recorded allowance.

+ References

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 326
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- Definition

Amount of expense (reversal of expense) for expected credit loss on financing receivable, from change in present value of expected cash flows.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

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