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Investments (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost | $ 57,608 | $ 56,576
Gross unrealized gains | 1,974 | 1,710
Gross unrealized losses | (191) | (447)
Fair value | 59,391 | 57,839
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 3,843 | 3,572
Gross unrealized gains | 65 | 74
Gross unrealized losses | (8) | (9)
Fair value | 3,900 | 3,637
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 7,484 | 7,116
Gross unrealized gains | 332 | 304
Gross unrealized losses | (22) | (87)
Fair value | 7,794 | 7,333
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 43,259 | 42,742
Gross unrealized gains | 1,419 | 1,178
Gross unrealized losses | (132) | (319)
Fair value | 44,546 | 43,601
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,077 | 1,043
Gross unrealized gains | 30 | 36
Gross unrealized losses | (14) | (4)
Fair value | 1,093 | 1,075
Asset-backed securities (“ABS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,263 | 1,169
Gross unrealized gains | 16 | 13
Gross unrealized losses | (9) | (11)
Fair value | 1,270 | 1,171
Residential mortgage-backed securities (“RMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 512 | 651
Gross unrealized gains | 101 | 85
Gross unrealized losses | (2) | (8)
Fair value | 611 | 728
Commercial mortgage-backed securities (“CMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 149 | 262
Gross unrealized gains | 8 | 17
Gross unrealized losses | (4) | (9)
Fair value | 153 | 270
Redeemable preferred stock |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 21 | 21
Gross unrealized gains | 3 | 3
Gross unrealized losses | 0 | 0
Fair value | $ 24 | $ 24

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