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Investments (Changes In Allowance For Credit Losses On AFS) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Balance as of beginning-of-period | $ 19 |
Balance as of end-of-period | 20 |
Accrued interest receivable on fixed maturity AFS securities | 1,000 | $ 1,100
Fixed Maturity AFS Securities [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Balance as of beginning-of-period | 19 | 13
Additions for securities for which credit losses were not previously recognized | 2 |
Additions (reductions) for securities for which credit losses were previously recognized |  | 1
Reductions for securities disposed | (1) |
Balance as of end-of-period | 20 | 14
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 | 17 | 12
Additions (reductions) for securities for which credit losses were previously recognized |  | 1
Reductions for securities disposed | (1) |
Balance as of end-of-period | 16 | 13
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
Additions for securities for which credit losses were not previously recognized | 1 |
Balance as of end-of-period | 2 | $ 1
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |
Balance as of end-of-period | 1 |
Fixed Maturity AFS Securities [Member] | Other [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 |
Balance as of end-of-period | $ 2 |

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- Definition 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. + References 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 + Details
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- Definition 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 + Details
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