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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |  |
Gross gains on sales | $ 27 | $ 77 | $ 201 | $ 190 |
Gross losses on sales | (12) | (4) | (42) | (44) |
Reduction due to intent to sell | 0 | 0 | (5) | 0 |
Net OTTI losses recognized in earnings |  | (1) |  | (3) |
Total net realized capital gains | 6 | 89 | (116) | 332 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | 36 | 17 | 6 | 100 |
Gain (Loss) on Disposition of Business | 51 |  | 51 |  |
Proceeds from Sale of Available-for-sale Securities | 4,500 | 2,600 | 11,700 | 11,500 |
Debt Securities, Available-for-sale, Amortized Cost | 41,073 |  | 41,073 |  | $ 40,078
Corporate |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost | 17,930 |  | 17,930 |  | $ 16,435
Other, net |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Other, net | (55) | (2) | 51 | 7 |
Non-qualifying foreign currency derivatives |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Non-qualifying foreign currency derivatives | (2) | (5) | 97 | 3 |
Non-qualifying foreign currency derivatives | Other Credit Derivatives |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Non-qualifying foreign currency derivatives | (4) |  | 6 |  |
Equity Securities [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity securities | 42 | 19 | (269) | 181 |
Total Fixed Maturities, AFS |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Change in ACL on fixed maturities, AFS | (1) |  | (33) |  |
Mortgages [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Change in ACL on mortgage loans | $ 5 |  | $ (19) |  |
Valuation allowances on mortgage loans |  | $ 0 |  | $ 1 |

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- Definition Amortized cost 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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: 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 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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