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Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |
Gross gains on sales | $ 234 | $ 114 | $ 275
Gross losses on sales | (56) | (172) | (113)
Net OTTI losses recognized in earnings | (3) | (1) | (8)
Total net realized capital gains (losses) | 395 | (112) | 165
Equity Securities, FV-NI, Unrealized Gain (Loss) | 164 | (80) |
Other investments |  |  |
Schedule of Investments [Line Items] |  |  |
Other, net | (35) | (5) | 12
Non-qualifying |  |  |
Schedule of Investments [Line Items] |  |  |
Non-qualifying foreign currency derivatives | (24) | (12) | (6)
Non-qualifying | Other Credit Derivatives [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Non-qualifying foreign currency derivatives | (9) | 1 | 14
Foreign Currency Derivatives | Non-qualifying |  |  |
Schedule of Investments [Line Items] |  |  |
Non-qualifying foreign currency derivatives | 1 | 3 | (14)
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Debt and Equity Securities, Gain (Loss) | 254 | (48) | 0
Net OTTI losses recognized in earnings |  |  | (6)
Mortgage loans |  |  |
Schedule of Investments [Line Items] |  |  |
Valuation allowances on mortgage loans | $ (1) | $ 0 | $ 1

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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=109980867&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=116654751&loc=SL75117546-209714 + Details
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