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Investment Securities (AFS and HTM Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Investment securities    
Total Investment securities: Amortized cost $ 79,673 $ 81,028
Total Investment securities: Gross unrealized gains 59 43
Total Investment securities: Gross unrealized losses 1,448 1,448
Total Investment securities: Fair value 78,284 79,623
AFS securities    
AFS debt securities: Amortized cost 56,059 64,091
AFS debt securities: Gross unrealized gains 51 41
AFS debt securities: Gross unrealized losses 912 968
AFS debt securities: Fair value 55,198 63,164
AFS equity securities: Amortized cost 15 15
AFS equity securities: Gross unrealized gains 0 0
AFS equity securities: Gross unrealized losses 10 9
AFS equity securities: Fair value 5 6
Total AFS securities: Amortized cost 56,074 64,106
Total AFS securities: Gross unrealized gains 51 41
Total AFS securities: Gross unrealized losses 922 977
Total AFS securities: Fair value 55,203 63,170
HTM securities    
HTM: Amortized Cost 23,599 16,922
HTM: Gross unrealized gains 8 2
HTM: Gross unrealized losses 526 471
HTM securities: Fair value 23,081 16,453
U.S. Government and Agency Securities    
AFS securities    
AFS debt securities: Amortized cost 49,645 50,719
AFS debt securities: Gross unrealized gains 28 15
AFS debt securities: Gross unrealized losses 836 823
AFS debt securities: Fair value 48,837 49,911
HTM securities    
HTM: Amortized Cost 23,310  
HTM: Gross unrealized gains 7  
HTM: Gross unrealized losses 525  
HTM securities: Fair value 22,792  
U.S. Treasury Securities    
AFS securities    
AFS debt securities: Amortized cost 26,842 28,371
AFS debt securities: Gross unrealized gains 0 1
AFS debt securities: Gross unrealized losses 589 545
AFS debt securities: Fair value 26,253 27,827
HTM securities    
HTM: Amortized Cost 11,424 5,839
HTM: Gross unrealized gains 0 1
HTM: Gross unrealized losses 305 283
HTM securities: Fair value 11,119 5,557
U.S. Agency Securities    
AFS securities    
AFS debt securities: Amortized cost 22,803 22,348
AFS debt securities: Gross unrealized gains 28 14
AFS debt securities: Gross unrealized losses 247 278
AFS debt securities: Fair value 22,584 22,084
HTM securities    
HTM: Amortized Cost 11,886 11,083
HTM: Gross unrealized gains 7 1
HTM: Gross unrealized losses 220 188
HTM securities: Fair value 11,673 10,896
Corporate and Other Debt    
AFS securities    
AFS debt securities: Amortized cost 6,414 13,372
AFS debt securities: Gross unrealized gains 23 26
AFS debt securities: Gross unrealized losses 76 145
AFS debt securities: Fair value 6,361 13,253
HTM securities    
HTM: Amortized Cost 289  
HTM: Gross unrealized gains 1  
HTM: Gross unrealized losses 1  
HTM securities: Fair value 289  
CMBS: Agency    
AFS securities    
AFS debt securities: Amortized cost 1,370 1,850
AFS debt securities: Gross unrealized gains 2 2
AFS debt securities: Gross unrealized losses 49 44
AFS debt securities: Fair value 1,323 1,808
CMBS: Non-Agency    
AFS securities    
AFS debt securities: Amortized cost 1,102 2,250
AFS debt securities: Gross unrealized gains 0 11
AFS debt securities: Gross unrealized losses 8 16
AFS debt securities: Fair value 1,094 2,245
HTM securities    
HTM: Amortized Cost 289  
HTM: Gross unrealized gains 1  
HTM: Gross unrealized losses 1  
HTM securities: Fair value 289  
Auto Loan ABS    
AFS securities    
AFS debt securities: Amortized cost   1,509
AFS debt securities: Gross unrealized gains   1
AFS debt securities: Gross unrealized losses   1
AFS debt securities: Fair value   1,509
Corporate Bonds    
AFS securities    
AFS debt securities: Amortized cost 1,379 3,836
AFS debt securities: Gross unrealized gains 5 7
AFS debt securities: Gross unrealized losses 12 22
AFS debt securities: Fair value 1,372 3,821
CLO    
AFS securities    
AFS debt securities: Amortized cost 398 540
AFS debt securities: Gross unrealized gains 1 0
AFS debt securities: Gross unrealized losses 0 1
AFS debt securities: Fair value $ 399 $ 539
FFELP Student Loan ABS    
Investment securities    
Percent of principal balance and interest guaranteed by the U.S. Department of Education 95.00% 95.00%
AFS securities    
AFS debt securities: Amortized cost $ 2,165 $ 3,387
AFS debt securities: Gross unrealized gains 15 5
AFS debt securities: Gross unrealized losses 7 61
AFS debt securities: Fair value $ 2,173 $ 3,331