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Investments - Investments - ACL on Fixed Maturities (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Beginning Balance | $ 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 39
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | (7)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | (9)
Ending Balance | 23
Corporate Debt Securities [Member] |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Beginning Balance | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 36
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | (4)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | (9)
Ending Balance | 23
Municipal |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |
Beginning Balance | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Not Previously Recorded | 3
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | (3)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 0
Ending Balance | $ 0

X
- 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=121582814&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=121582814&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=121645371&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=121558606&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=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of increase (decrease) in allowance for credit loss of 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121582814&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 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=121582814&loc=SL82922900-210455 + Details
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