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Investments - Investments - Net Realized Capital Gains (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Schedule of Investments [Line Items] |  |
Gross gains on sales | $ 78 | $ 44
Gross losses on sales | (8) | (21)
Reduction due to intent to sell | (5) | 0
Net OTTI losses recognized in earnings |  | (2)
Total net realized capital gains | (231) | 163
Equity Securities, FV-NI, Unrealized Gain (Loss) | (277) | 68
Proceeds from Sale of Available-for-sale Securities | 3,100 | 4,300
Other, net |  |
Schedule of Investments [Line Items] |  |
Other, net | 104 | 10
Non-qualifying foreign currency derivatives |  |
Schedule of Investments [Line Items] |  |
Non-qualifying foreign currency derivatives | 92 | 15
Non-qualifying foreign currency derivatives | Other Credit Derivatives |  |
Schedule of Investments [Line Items] |  |
Non-qualifying foreign currency derivatives | 10 | 0
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Equity securities | (386) | $ 132
Accounting Standards Update 2016-13 [Member] | Total Fixed Maturities, AFS |  |
Schedule of Investments [Line Items] |  |
Change in ACL on fixed maturities, AFS | (12) |
Accounting Standards Update 2016-13 [Member] | Mortgages [Member] |  |
Schedule of Investments [Line Items] |  |
Change in ACL on mortgage loans | $ (2) |

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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=118955579&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=118955579&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=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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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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