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Investments (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available for Sale Securities |  |
Amortized cost | $ 56,901 | $ 56,576
Gross unrealized gains | 1,963 | 1,710
Gross unrealized losses | (208) | (447)
Fair value | 58,656 | 57,839
U.S. government and agencies |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 3,363 | 3,572
Gross unrealized gains | 70 | 74
Gross unrealized losses | (7) | (9)
Fair value | 3,426 | 3,637
Municipal |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 7,543 | 7,116
Gross unrealized gains | 336 | 304
Gross unrealized losses | (24) | (87)
Fair value | 7,855 | 7,333
Corporate |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 43,007 | 42,742
Gross unrealized gains | 1,394 | 1,178
Gross unrealized losses | (150) | (319)
Fair value | 44,251 | 43,601
Foreign government |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,019 | 1,043
Gross unrealized gains | 34 | 36
Gross unrealized losses | (6) | (4)
Fair value | 1,047 | 1,075
Asset-backed securities (“ABS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 1,237 | 1,169
Gross unrealized gains | 16 | 13
Gross unrealized losses | (10) | (11)
Fair value | 1,243 | 1,171
Residential mortgage-backed securities (“RMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 549 | 651
Gross unrealized gains | 96 | 85
Gross unrealized losses | (4) | (8)
Fair value | 641 | 728
Commercial mortgage-backed securities (“CMBS”) |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 163 | 262
Gross unrealized gains | 14 | 17
Gross unrealized losses | (7) | (9)
Fair value | 170 | 270
Redeemable preferred stock |  |
Schedule of Available for Sale Securities |  |
Amortized cost | 20 | 21
Gross unrealized gains | 3 | 3
Gross unrealized losses | 0 | 0
Fair value | $ 23 | $ 24

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