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Investments - Available for sale fixed maturities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | $ 42,418 | $ 41,837
Available for sale (AFS) fixed maturities | 43,431 | 41,997
Total fixed maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 42,418 | 41,837
Fixed maturities, Available for sale, Gross Unrealized, Gains | 1,202 | 763
Fixed maturities, Available for sale, Gross Unrealized, Losses | (189) | (603)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 1,013 | 160
Available for sale (AFS) fixed maturities | 43,431 | 41,997
U.S. Government and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 233 | 235
Fixed maturities, Available for sale, Gross Unrealized, Gains | 2 | 1
Fixed maturities, Available for sale, Gross Unrealized, Losses | (2) | (3)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 0 | (2)
Available for sale (AFS) fixed maturities | 233 | 233
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 6,744 | 6,825
Fixed maturities, Available for sale, Gross Unrealized, Gains | 253 | 169
Fixed maturities, Available for sale, Gross Unrealized, Losses | (20) | (55)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 233 | 114
Available for sale (AFS) fixed maturities | 6,977 | 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 | 2 | 2
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | 0
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 2 | 2
Available for sale (AFS) fixed maturities | 148 | 142
Residential MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 2,477 | 2,476
Fixed maturities, Available for sale, Gross Unrealized, Gains | 287 | 277
Fixed maturities, Available for sale, Gross Unrealized, Losses | (8) | (9)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 279 | 268
Available for sale (AFS) fixed maturities | 2,756 | 2,744
Commercial MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 900 | 905
Fixed maturities, Available for sale, Gross Unrealized, Gains | 24 | 17
Fixed maturities, Available for sale, Gross Unrealized, Losses | 0 | (2)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 24 | 15
Available for sale (AFS) fixed maturities | 924 | 920
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 9,909 | 9,781
Fixed maturities, Available for sale, Gross Unrealized, Gains | 163 | 130
Fixed maturities, Available for sale, Gross Unrealized, Losses | (54) | (100)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 109 | 30
Available for sale (AFS) fixed maturities | 10,018 | 9,811
Corporate and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fixed maturities, Available for sale, Amortized Cost | 22,009 | 21,475
Fixed maturities, Available for sale, Gross Unrealized, Gains | 471 | 167
Fixed maturities, Available for sale, Gross Unrealized, Losses | (105) | (434)
Fixed maturities, Available for sale, Net Unrealized, Gains (Losses) | 366 | (267)
Available for sale (AFS) fixed maturities | $ 22,375 | $ 21,208

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- Definition Amount before tax of net unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References No definition available. + Details
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