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Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |
Gross gains on sales | $ 255 | $ 234 | $ 114
Gross losses on sales | (50) | (56) | (172)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | (9) |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Sell before Recovery | (5) | 0 | 0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  | (3) | (1)
Total net realized capital gains (losses) | (14) | 395 | (112)
Equity Securities, FV-NI, Unrealized Gain (Loss) | 53 | 164 | (80)
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax | (48) | 0 | 202
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Continental Europe Operations [Member] | Interest rate swaps |  |  |
Schedule of Investments [Line Items] |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax | 48 |  |
Other investments |  |  |
Schedule of Investments [Line Items] |  |  |
Other, net | 47 | (35) | (5)
Non-qualifying |  |  |
Schedule of Investments [Line Items] |  |  |
Non-qualifying foreign currency derivatives | 104 | (24) | (12)
Non-qualifying | Other Credit Derivatives [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Non-qualifying foreign currency derivatives | (1) | (9) | 1
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt and Equity Securities, Gain (Loss) | (214) | 254 | (48)
Total fixed maturities |  |  |
Schedule of Investments [Line Items] |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | (28) |  |
Mortgage loans |  |  |
Schedule of Investments [Line Items] |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | $ (19) |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment |  | $ (1) | $ 0

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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 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=121582814&loc=SL82922900-210455 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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