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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)