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Fair Value - Fair Value Option (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]          
Total gains (losses) $ (37,000,000) $ 14,000,000 $ 70,000,000 $ 58,000,000  
Mortgage loans          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value option, loans, 90 days or more past due 0   0   $ 0
Total gains (losses) 0 0 0 1,000,000  
Unpaid principal balance 17,000,000   17,000,000   25,000,000
Mark to fair value 2,000,000   2,000,000   2,000,000
Fair value 19,000,000   19,000,000   $ 27,000,000
Investment related gains (losses) | Trading securities          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Total gains (losses) 24,000,000 48,000,000 (8,000,000) 183,000,000  
Net investment income | Investment funds          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Total gains (losses) (57,000,000) 3,000,000 109,000,000 3,000,000  
Future policy and other policy benefits | Future policy benefits          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Total gains (losses) $ (4,000,000) $ (37,000,000) $ (31,000,000) $ (129,000,000)