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Investments - Investments - Net Realized Capital Gains (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule of Investments [Line Items]        
Gross gains on sales $ 69 $ 46 $ 113 $ 65
Gross losses on sales (19) (31) (40) (88)
Net OTTI losses recognized in earnings 0 0 (2) 0
Transactional foreign currency revaluation 0 0 0 1
Total net realized capital gains (losses) 80 52 243 22
Equity Securities, FV-NI, Unrealized Gain (Loss) 29 17 74 11
Other net realized capital gains 80 52 245 22
Proceeds from Sale of Available-for-sale Securities 4,600 4,200 8,900 8,500
Net Unrealized Gain on Securities | Reclassification out of Accumulated Other Comprehensive Income        
Schedule of Investments [Line Items]        
Other net realized capital gains 50 (6) 71 (44)
Other, net        
Schedule of Investments [Line Items]        
Other, net 0 7 9 1
Non-qualifying foreign currency derivatives        
Schedule of Investments [Line Items]        
Non-qualifying foreign currency derivatives (7) 12 8 (1)
Non-qualifying foreign currency derivatives | Other Credit Derivatives        
Schedule of Investments [Line Items]        
Non-qualifying foreign currency derivatives (6) 8 8 (2)
Foreign Exchange Forward [Member] | Non-qualifying foreign currency derivatives        
Schedule of Investments [Line Items]        
Non-qualifying foreign currency derivatives (1) 4 0 1
Equity Securities [Member]        
Schedule of Investments [Line Items]        
Equity securities 30 26 162 42
Mortgages [Member]        
Schedule of Investments [Line Items]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment $ (1) $ 0 $ (1) $ 0