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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