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Investments - Available for sale fixed maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost $ 42,908 $ 41,837
Available for sale (AFS) fixed maturities 44,710 41,997
Total fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 42,908 41,837
Fixed maturities, Available for sale, Gross Unrealized, Gains 1,895 763
Fixed maturities, Available for sale, Gross Unrealized, Losses (93) (603)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 1,802 160
Available for sale (AFS) fixed maturities 44,710 41,997
U.S. Government and government agencies    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 226 235
Fixed maturities, Available for sale, Gross Unrealized, Gains 4 1
Fixed maturities, Available for sale, Gross Unrealized, Losses (2) (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 2 (2)
Available for sale (AFS) fixed maturities 228 233
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 6,628 6,825
Fixed maturities, Available for sale, Gross Unrealized, Gains 374 169
Fixed maturities, Available for sale, Gross Unrealized, Losses (6) (55)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 368 114
Available for sale (AFS) fixed maturities 6,996 6,939
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 146 140
Fixed maturities, Available for sale, Gross Unrealized, Gains 3 2
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 3 2
Available for sale (AFS) fixed maturities 149 142
Residential MBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 2,368 2,476
Fixed maturities, Available for sale, Gross Unrealized, Gains 303 277
Fixed maturities, Available for sale, Gross Unrealized, Losses (4) (9)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 299 268
Available for sale (AFS) fixed maturities 2,667 2,744
Commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 938 905
Fixed maturities, Available for sale, Gross Unrealized, Gains 36 17
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 (2)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 36 15
Available for sale (AFS) fixed maturities 974 920
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 4,359 4,350
Fixed maturities, Available for sale, Gross Unrealized, Gains 10 1
Fixed maturities, Available for sale, Gross Unrealized, Losses (36) (73)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) (26) (72)
Available for sale (AFS) fixed maturities 4,333 4,278
Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 5,749 5,431
Fixed maturities, Available for sale, Gross Unrealized, Gains 205 129
Fixed maturities, Available for sale, Gross Unrealized, Losses (10) (27)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 195 102
Available for sale (AFS) fixed maturities 5,944 5,533
Corporate and other    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 22,494 21,475
Fixed maturities, Available for sale, Gross Unrealized, Gains 960 167
Fixed maturities, Available for sale, Gross Unrealized, Losses (35) (434)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 925 (267)
Available for sale (AFS) fixed maturities $ 23,419 $ 21,208