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Investments - Available for sale fixed maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost $ 46,101 $ 44,524
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses (61) 0
Available for sale (AFS) fixed maturities 46,134 46,505
Total fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 46,101 44,524
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses (61) 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 1,418 2,069
Fixed maturities, Available for sale, Gross Unrealized, Losses (1,324) (88)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 94 1,981
Available for sale (AFS) fixed maturities 46,134 46,505
U.S. Government and government agencies    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 190 199
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses 0 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 15 10
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 15 10
Available for sale (AFS) fixed maturities 205 209
States, municipalities and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 6,526 6,604
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses 0 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 388 363
Fixed maturities, Available for sale, Gross Unrealized, Losses (8) (4)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 380 359
Available for sale (AFS) fixed maturities 6,906 6,963
Foreign government    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 164 170
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses 0 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 6 3
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 (1)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 6 2
Available for sale (AFS) fixed maturities 170 172
Residential MBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 3,078 2,900
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses (6) 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 133 265
Fixed maturities, Available for sale, Gross Unrealized, Losses (74) (5)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 59 260
Available for sale (AFS) fixed maturities 3,131 3,160
Commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 892 896
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses 0 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 20 31
Fixed maturities, Available for sale, Gross Unrealized, Losses (5) 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 15 31
Available for sale (AFS) fixed maturities 907 927
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 4,456 4,307
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses (17) 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 5 10
Fixed maturities, Available for sale, Gross Unrealized, Losses (306) (37)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) (301) (27)
Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 7,069 6,992
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses (14) 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 65 156
Fixed maturities, Available for sale, Gross Unrealized, Losses (362) (20)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) (297) 136
Available for sale (AFS) fixed maturities 6,758 7,128
Corporate and other    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, Available for sale, Amortized Cost 23,726 22,456
Fixed maturities, Available for Sale, Allowance for Expected Credit Losses (24) 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 786 1,231
Fixed maturities, Available for sale, Gross Unrealized, Losses (569) (21)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) 217 1,210
Available for sale (AFS) fixed maturities 23,919 23,666
Managed by third parties | Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Available for sale (AFS) fixed maturities $ 4,138 $ 4,280