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Investment Securities - Fair Value and Gross Unrealized Losses by Aging Category (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Available-for-sale securities    
Less than 12 months, Fair value $ 57,213 $ 50,325
Less than 12 months, Gross unrealized losses 242 550
12 months or more, Fair Value 17,093 36,706
12 months or more, Gross unrealized losses 114 993
Total fair value 74,306 87,031
Total gross unrealized losses 356 1,543
Held-to-maturity securities    
Less than 12 months, Fair value 1 4,397
Less than 12 months, Gross unrealized losses 0 23
12 months or more, Fair value 2,747 8,196
12 months or more, Gross unrealized losses 12 192
Total fair value 2,748 12,593
Total gross unrealized losses 12 215
Total investment securities with gross unrealized losses    
Less than 12 months, Fair value 57,214 54,722
Less than 12 months, Gross unrealized losses 242 573
12 months or more, Fair value 19,840 44,902
12 months or more, Gross unrealized losses 126 1,185
Total fair value 77,054 99,624
Total gross unrealized losses 368 1,758
Total mortgage-backed securities    
Available-for-sale securities    
Less than 12 months, Fair value 6,246 20,160
Less than 12 months, Gross unrealized losses 49 333
12 months or more, Fair Value 7,787 27,510
12 months or more, Gross unrealized losses 55 825
Total fair value 14,033 47,670
Total gross unrealized losses 104 1,158
Held-to-maturity securities    
Less than 12 months, Fair value 1 4,385
Less than 12 months, Gross unrealized losses 0 23
12 months or more, Fair value 2,747 7,082
12 months or more, Gross unrealized losses 12 177
Total fair value 2,748 11,467
Total gross unrealized losses 12 200
U.S. government agencies    
Available-for-sale securities    
Less than 12 months, Fair value 5,701 17,656
Less than 12 months, Gross unrealized losses 48 318
12 months or more, Fair Value 5,704 22,728
12 months or more, Gross unrealized losses 38 656
Total fair value 11,405 40,384
Total gross unrealized losses 86 974
Held-to-maturity securities    
Less than 12 months, Fair value 1 4,385
Less than 12 months, Gross unrealized losses 0 23
12 months or more, Fair value 2,747 7,082
12 months or more, Gross unrealized losses 12 177
Total fair value 2,748 11,467
Total gross unrealized losses 12 200
Residential: U.S.    
Available-for-sale securities    
Less than 12 months, Fair value 3 623
Less than 12 months, Gross unrealized losses 0 4
12 months or more, Fair Value 681 1,445
12 months or more, Gross unrealized losses 5 27
Total fair value 684 2,068
Total gross unrealized losses 5 31
Residential: Non-U.S.    
Available-for-sale securities    
Less than 12 months, Fair value 122 907
Less than 12 months, Gross unrealized losses 0 5
12 months or more, Fair Value 559 165
12 months or more, Gross unrealized losses 2 1
Total fair value 681 1,072
Total gross unrealized losses 2 6
Commercial    
Available-for-sale securities    
Less than 12 months, Fair value 420 974
Less than 12 months, Gross unrealized losses 1 6
12 months or more, Fair Value 843 3,172
12 months or more, Gross unrealized losses 10 141
Total fair value 1,263 4,146
Total gross unrealized losses 11 147
U.S. Treasury and government agencies    
Available-for-sale securities    
Less than 12 months, Fair value 38,553 4,792
Less than 12 months, Gross unrealized losses 169 7
12 months or more, Fair Value 0 2,391
12 months or more, Gross unrealized losses 0 71
Total fair value 38,553 7,183
Total gross unrealized losses 169 78
Obligations of U.S. states and municipalities    
Available-for-sale securities    
Less than 12 months, Fair value 0 1,808
Less than 12 months, Gross unrealized losses 0 15
12 months or more, Fair Value 205 2,477
12 months or more, Gross unrealized losses 1 65
Total fair value 205 4,285
Total gross unrealized losses 1 80
Held-to-maturity securities    
Less than 12 months, Fair value 0 12
Less than 12 months, Gross unrealized losses 0 0
12 months or more, Fair value 0 1,114
12 months or more, Gross unrealized losses 0 15
Total fair value 0 1,126
Total gross unrealized losses 0 15
Certificates of deposit    
Available-for-sale securities    
Less than 12 months, Fair value 74 75
Less than 12 months, Gross unrealized losses 0 0
12 months or more, Fair Value 0 0
12 months or more, Gross unrealized losses 0 0
Total fair value 74 75
Total gross unrealized losses 0 0
Non-U.S. government debt securities    
Available-for-sale securities    
Less than 12 months, Fair value 3,923 3,123
Less than 12 months, Gross unrealized losses 5 5
12 months or more, Fair Value 897 1,937
12 months or more, Gross unrealized losses 3 15
Total fair value 4,820 5,060
Total gross unrealized losses 8 20
Corporate debt securities    
Available-for-sale securities    
Less than 12 months, Fair value 47 478
Less than 12 months, Gross unrealized losses 0 8
12 months or more, Fair Value 115 37
12 months or more, Gross unrealized losses 2 1
Total fair value 162 515
Total gross unrealized losses 2 9
Asset-backed securities: Collateralized loan obligations    
Available-for-sale securities    
Less than 12 months, Fair value 7,766 18,681
Less than 12 months, Gross unrealized losses 16 176
12 months or more, Fair Value 6,034 0
12 months or more, Gross unrealized losses 46 0
Total fair value 13,800 18,681
Total gross unrealized losses 62 176
Asset-backed securities: Other    
Available-for-sale securities    
Less than 12 months, Fair value 604 1,208
Less than 12 months, Gross unrealized losses 3 6
12 months or more, Fair Value 2,055 2,354
12 months or more, Gross unrealized losses 7 16
Total fair value 2,659 3,562
Total gross unrealized losses $ 10 $ 22