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Investments - Allowance for Credit Loss Aggregated by Investment Category (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | $ (8) | $ (19)
For credit losses on securities for which losses were not previously recorded | (3) | (1)
For initial credit losses on purchased securities accounted for as PCD financial assets | 0 | 0
(Additions) reductions in allowance recorded on previously impaired securities | (2) | 7
For securities sold during the period | 2 | 0
For securities intended/required to be sold prior to recovery of amortized cost basis | 0 | 0
Write-offs charged against the allowance | 0 | 3
Recoveries of amounts previously written off | 0 | 3
Balance at End of Period | (11) | (7)
Asset-backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | (3) |
For credit losses on securities for which losses were not previously recorded | 0 |
For initial credit losses on purchased securities accounted for as PCD financial assets | 0 |
(Additions) reductions in allowance recorded on previously impaired securities | 0 |
For securities sold during the period | 2 |
For securities intended/required to be sold prior to recovery of amortized cost basis | 0 |
Write-offs charged against the allowance | 0 |
Recoveries of amounts previously written off | 0 |
Balance at End of Period | (1) |
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | (2) | 0
For credit losses on securities for which losses were not previously recorded | 0 | (1)
For initial credit losses on purchased securities accounted for as PCD financial assets | 0 | 0
(Additions) reductions in allowance recorded on previously impaired securities | 0 | 0
For securities sold during the period | 0 | 0
For securities intended/required to be sold prior to recovery of amortized cost basis | 0 | 0
Write-offs charged against the allowance | 0 | 0
Recoveries of amounts previously written off | 0 | 0
Balance at End of Period | (2) | (1)
Corporates |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0 | (16)
For credit losses on securities for which losses were not previously recorded | (3) | 0
For initial credit losses on purchased securities accounted for as PCD financial assets | 0 | 0
(Additions) reductions in allowance recorded on previously impaired securities | 0 | 7
For securities sold during the period | 0 | 0
For securities intended/required to be sold prior to recovery of amortized cost basis | 0 | 0
Write-offs charged against the allowance | 0 | 3
Recoveries of amounts previously written off | 0 | 3
Balance at End of Period | (3) | (3)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | (3) | (3)
For credit losses on securities for which losses were not previously recorded | 0 | 0
For initial credit losses on purchased securities accounted for as PCD financial assets | 0 | 0
(Additions) reductions in allowance recorded on previously impaired securities | (2) | 0
For securities sold during the period | 0 | 0
For securities intended/required to be sold prior to recovery of amortized cost basis | 0 | 0
Write-offs charged against the allowance | 0 | 0
Recoveries of amounts previously written off | 0 | 0
Balance at End of Period | $ (5) | $ (3)

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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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- Definition Amount of expense 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), for which no credit loss was previously recorded. + 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 (b) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of increase in 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) and beneficial interest, purchased with credit deterioration. + 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 (c) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of decrease in 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) from 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 (d) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of decrease in 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) from intent to sell or more likely than not will be required to sell before recovery of amortized cost basis. + 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 (e) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of writeoff 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 (g) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82922868-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922897-210455 + Details
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- Definition Amount of cash inflow from recovery of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), previously written off. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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