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Investments - Available for sale fixed maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost $ 44,524 $ 41,837
Available for sale (AFS) fixed maturities 46,505 41,997
Total fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 44,524 41,837
Fixed maturities, Available for sale, Gross Unrealized, Gains 2,069 763
Fixed maturities, Available for sale, Gross Unrealized, Losses (88) (603)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 1,981 160
Available for sale (AFS) fixed maturities 46,505 41,997
U.S. Government and government agencies    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 199 235
Fixed maturities, Available for sale, Gross Unrealized, Gains 10 1
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 10 (2)
Available for sale (AFS) fixed maturities 209 233
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 6,604 6,825
Fixed maturities, Available for sale, Gross Unrealized, Gains 363 169
Fixed maturities, Available for sale, Gross Unrealized, Losses (4) (55)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 359 114
Available for sale (AFS) fixed maturities 6,963 6,939
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 170 140
Fixed maturities, Available for sale, Gross Unrealized, Gains 3 2
Fixed maturities, Available for sale, Gross Unrealized, Losses (1) 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 2 2
Available for sale (AFS) fixed maturities 172 142
Residential MBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 2,900 2,476
Fixed maturities, Available for sale, Gross Unrealized, Gains 265 277
Fixed maturities, Available for sale, Gross Unrealized, Losses (5) (9)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 260 268
Available for sale (AFS) fixed maturities 3,160 2,744
Commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 896 905
Fixed maturities, Available for sale, Gross Unrealized, Gains 31 17
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 (2)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 31 15
Available for sale (AFS) fixed maturities 927 920
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 4,307 4,350
Fixed maturities, Available for sale, Gross Unrealized, Gains 10 1
Fixed maturities, Available for sale, Gross Unrealized, Losses (37) (73)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) (27) (72)
Available for sale (AFS) fixed maturities 4,280 4,278
Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 6,992 5,431
Fixed maturities, Available for sale, Gross Unrealized, Gains 156 129
Fixed maturities, Available for sale, Gross Unrealized, Losses (20) (27)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 136 102
Available for sale (AFS) fixed maturities 7,128 5,533
Corporate and other    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 22,456 21,475
Fixed maturities, Available for sale, Gross Unrealized, Gains 1,231 167
Fixed maturities, Available for sale, Gross Unrealized, Losses (21) (434)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 1,210 (267)
Available for sale (AFS) fixed maturities $ 23,666 $ 21,208