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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Investments [Line Items] |  |  |  |
Gross gains on sales | $ 96,000,000 | $ 69,000,000 | $ 174,000,000 | $ 113,000,000
Gross losses on sales | (22,000,000) | (19,000,000) | (30,000,000) | (40,000,000)
Reduction due to intent to sell | 0 | 0 | (5,000,000) | 0
Net OTTI losses recognized in earnings |  | 0 |  | (2,000,000)
Total net realized capital gains | 109,000,000 | 80,000,000 | (122,000,000) | 243,000,000
Equity Securities, FV-NI, Unrealized Gain (Loss) | 67,000,000 | 29,000,000 | (34,000,000) | 74,000,000
Proceeds from Sale of Available-for-sale Securities | 4,100,000,000 | 4,600,000,000 | 7,200,000,000 | 8,900,000,000
Other, net |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Other, net | 2,000,000 | (1,000,000) | 106,000,000 | 9,000,000
Non-qualifying foreign currency derivatives |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | 7,000,000 | (7,000,000) | 99,000,000 | 8,000,000
Non-qualifying foreign currency derivatives | Other Credit Derivatives |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | 0 |  | 10,000,000 |
Equity Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity securities | 75,000,000 | 30,000,000 | (311,000,000) | 162,000,000
Total Fixed Maturities, AFS |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Change in ACL on fixed maturities, AFS | (20,000,000) |  | (32,000,000) |
Mortgages [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Change in ACL on mortgage loans | $ (22,000,000) |  | $ (24,000,000) |
Valuation allowances on mortgage loans |  | $ 1,000,000 |  | $ 1,000,000

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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + 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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- 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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