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Fair Value Measurement and Fair Value of Financial Instruments - Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair value measurements    
Trading account assets(2): $ 12,320 $ 10,567
Securities available for sale(3): 16,017  
U.S. Treasury    
Fair value measurements    
Securities available for sale(3): 3,367  
Other    
Fair value measurements    
Securities available for sale(3): 149  
U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3): 7,792  
Privately issued    
Fair value measurements    
Securities available for sale(3): 874  
Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3): 1,487  
Other    
Fair value measurements    
Securities available for sale(3): 5  
Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 1,399  
Level 1    
Fair value measurements    
Securities available for sale(3):   0
Other assets: 65 0
FDIC clawback liability(2)   0
Other liabilities:   0
Level 1 | U.S. Treasury    
Fair value measurements    
Trading account assets(2):   0
Securities available for sale(3):   0
Trading account liabilities(2):   0
Level 1 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2):   0
Level 1 | State and municipal    
Fair value measurements    
Trading account assets(2):   0
Level 1 | Commercial paper    
Fair value measurements    
Trading account assets(2):   0
Level 1 | Other    
Fair value measurements    
Trading account assets(2):   0
Securities available for sale(3):   0
Trading account liabilities(2):   0
Level 1 | Corporate bonds    
Fair value measurements    
Trading account assets(2):   0
Level 1 | Asset-backed securities    
Fair value measurements    
Trading account assets(2):   0
Level 1 | Mortgage-backed securities    
Fair value measurements    
Trading account assets(2):   0
Level 1 | Commodity derivative contracts    
Fair value measurements    
Trading account assets(2):   0
Trading account liabilities(2):   0
Level 1 | Equity derivative contracts    
Fair value measurements    
Trading account liabilities(2):   7
Level 1 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3):   0
Level 1 | Privately issued    
Fair value measurements    
Securities available for sale(3):   0
Level 1 | Privately issued commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale(3):   0
Level 1 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3):   0
Level 1 | Other    
Fair value measurements    
Securities available for sale(3):   0
Level 1 | Mortgage servicing rights    
Fair value measurements    
Other assets:   0
Level 1 | Interest rate hedging contracts    
Fair value measurements    
Other assets:   0
Level 1 | Corporate bonds    
Fair value measurements    
Trading account liabilities(2):   0
Level 1 | Other derivative contracts    
Fair value measurements    
Other assets:   0
Other liabilities:   0
Level 2    
Fair value measurements    
Securities available for sale(3):   0
Other assets: 0 0
Trading account liabilities(2):   0
FDIC clawback liability(2)   0
Level 2 | Equity securities    
Fair value measurements    
Trading account assets(2):   0
Securities available for sale(3):   0
Level 2 | Equity derivative contracts    
Fair value measurements    
Trading account assets(2):   0
Trading account liabilities(2):   0
Level 2 | Mortgage servicing rights    
Fair value measurements    
Other assets:   0
Level 3    
Fair value measurements    
Other assets: 0 0
Trading account liabilities(2):   0
Other liabilities:   0
Level 3 | U.S. Treasury    
Fair value measurements    
Trading account assets(2):   0
Securities available for sale(3):   0
Trading account liabilities(2):   0
Level 3 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2):   0
Level 3 | State and municipal    
Fair value measurements    
Trading account assets(2):   0
Level 3 | Commercial paper    
Fair value measurements    
Trading account assets(2):   0
Level 3 | Other    
Fair value measurements    
Trading account assets(2):   0
Trading account liabilities(2):   0
Level 3 | Corporate bonds    
Fair value measurements    
Trading account assets(2):   0
Level 3 | Asset-backed securities    
Fair value measurements    
Trading account assets(2):   0
Level 3 | Mortgage-backed securities    
Fair value measurements    
Trading account assets(2):   0
Level 3 | Equity securities    
Fair value measurements    
Trading account assets(2):   0
Securities available for sale(3):   0
Level 3 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3):   0
Level 3 | Privately issued    
Fair value measurements    
Securities available for sale(3):   0
Level 3 | Privately issued commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale(3):   0
Level 3 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3):   0
Level 3 | Other    
Fair value measurements    
Securities available for sale(3):   0
Level 3 | Interest rate hedging contracts    
Fair value measurements    
Other assets:   0
Level 3 | Corporate bonds    
Fair value measurements    
Trading account liabilities(2):   0
Fair Value    
Fair value measurements    
Other assets: 65 0
Fair Value, Measurements, Recurring    
Fair value measurements    
Netting Adjustment $ (331) [1] $ (607) [2]
Percentage of total 100.00% 100.00%
Netting Adjustment 1.00% 2.00%
Percentage of total Company assets 18.00% 18.00%
Netting Adjustment (0.00%) (0.00%)
Netting Adjustment $ (336) [1] $ (620) [2]
Percentage of total 100.00% 100.00%
Netting Adjustment 7.00% 17.00%
Percentage of total Company liabilities 4.00% 3.00%
Netting Adjustment (0.00%) (0.00%)
Fair Value, Measurements, Recurring | Interest rate derivative contracts    
Fair value measurements    
Netting Adjustment $ (136) $ (353)
Netting Adjustment (243) (382)
Fair Value, Measurements, Recurring | Commodity derivative contracts    
Fair value measurements    
Netting Adjustment (34) (49)
Netting Adjustment (23) (20)
Fair Value, Measurements, Recurring | Foreign exchange derivative contracts    
Fair value measurements    
Netting Adjustment (114) (68)
Netting Adjustment (58) (66)
Fair Value, Measurements, Recurring | Equity derivative contracts    
Fair value measurements    
Netting Adjustment (47) (135)
Netting Adjustment 0  
Fair Value, Measurements, Recurring | Trading securities    
Fair value measurements    
Netting Adjustment (331) [1] (605) [2]
Netting Adjustment (324) [1] (468) [2]
Fair Value, Measurements, Recurring | Other    
Fair value measurements    
Netting Adjustment [2] 0 (2)
Fair Value, Measurements, Recurring | Interest rate hedging contracts    
Fair value measurements    
Netting Adjustment 0 0
Netting Adjustment   (149)
Fair Value, Measurements, Recurring | Other derivative contracts    
Fair value measurements    
Netting Adjustment 0 (2)
Netting Adjustment (12) (3)
Fair Value, Measurements, Recurring | Equity securities    
Fair value measurements    
Netting Adjustment 0  
Fair Value, Measurements, Recurring | Total other liabilities    
Fair value measurements    
Netting Adjustment (12) [1] (152) [2]
Fair Value, Measurements, Recurring | Level 1    
Fair value measurements    
Trading account assets(2):   202
Securities available for sale(3): 0 10
Other assets: 10  
Total assets $ 234 $ 212
Percentage of total 1.00% 1.00%
Percentage of total Company assets 0.00% 0.00%
Trading account liabilities(2): $ 142 $ 46
FDIC clawback liability(2) 0  
Other liabilities: 0  
Total liabilities $ 142 $ 46
Percentage of total 3.00% 1.00%
Percentage of total Company liabilities 0.00% 0.00%
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury    
Fair value measurements    
Trading account assets(2): $ 0  
Securities available for sale(3): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 1 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 1 | State and municipal    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Commercial paper    
Fair value measurements    
Trading account assets(2): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Other    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Mortgage-backed securities    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Equity securities    
Fair value measurements    
Trading account assets(2): 212 $ 193
Securities available for sale(3):   10
Trading account liabilities(2): 101 35
Fair Value, Measurements, Recurring | Level 1 | Interest rate derivative contracts    
Fair value measurements    
Trading account assets(2): 9 7
Trading account liabilities(2): 37 3
Fair Value, Measurements, Recurring | Level 1 | Commodity derivative contracts    
Fair value measurements    
Trading account assets(2): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets(2): 0 0
Trading account liabilities(2): 1 1
Fair Value, Measurements, Recurring | Level 1 | Equity derivative contracts    
Fair value measurements    
Trading account assets(2): 3 2
Trading account liabilities(2): 3  
Fair Value, Measurements, Recurring | Level 1 | Trading securities    
Fair value measurements    
Trading account assets(2): 224  
Fair Value, Measurements, Recurring | Level 1 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 1 | Privately issued    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 1 | Privately issued commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 1 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 1 | Other    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 1 | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 1 | Mortgage servicing rights    
Fair value measurements    
Other assets: 0  
Fair Value, Measurements, Recurring | Level 1 | Interest rate hedging contracts    
Fair value measurements    
Other assets: 0  
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds    
Fair value measurements    
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Other derivative contracts    
Fair value measurements    
Other assets: 0  
Other liabilities: 0  
Fair Value, Measurements, Recurring | Level 1 | Equity securities    
Fair value measurements    
Other assets: 10  
Fair Value, Measurements, Recurring | Level 2    
Fair value measurements    
Trading account assets(2):   10,831
Securities available for sale(3): 14,522 15,954
Other assets: 4 4
Total assets $ 26,903 $ 26,789
Percentage of total 94.00% 95.00%
Percentage of total Company assets 17.00% 17.00%
Trading account liabilities(2): $ 5,124 $ 3,884
FDIC clawback liability(2) 0  
Other liabilities: 16 152
Total liabilities $ 5,140 $ 4,036
Percentage of total 101.00% 109.00%
Percentage of total Company liabilities 4.00% 3.00%
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury    
Fair value measurements    
Trading account assets(2): $ 2,773 $ 1,926
Securities available for sale(3): 3,367 3,252
Trading account liabilities(2): 3,488 2,709
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2): 115 118
Fair Value, Measurements, Recurring | Level 2 | State and municipal    
Fair value measurements    
Trading account assets(2): 12 11
Fair Value, Measurements, Recurring | Level 2 | Commercial paper    
Fair value measurements    
Trading account assets(2): 31 7
Trading account liabilities(2): 35  
Fair Value, Measurements, Recurring | Level 2 | Other    
Fair value measurements    
Trading account assets(2):   8
Securities available for sale(3): 53 68
Trading account liabilities(2):   7
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds    
Fair value measurements    
Trading account assets(2): 1,410 1,054
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Fair value measurements    
Trading account assets(2): 318 199
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities    
Fair value measurements    
Trading account assets(2): 6,978 6,339
Fair Value, Measurements, Recurring | Level 2 | Equity securities    
Fair value measurements    
Trading account assets(2): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 2 | Interest rate derivative contracts    
Fair value measurements    
Trading account assets(2): 459 870
Trading account liabilities(2): 651 643
Fair Value, Measurements, Recurring | Level 2 | Commodity derivative contracts    
Fair value measurements    
Trading account assets(2): 43 50
Trading account liabilities(2): 32 33
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets(2): 238 249
Trading account liabilities(2): 139 144
Fair Value, Measurements, Recurring | Level 2 | Equity derivative contracts    
Fair value measurements    
Trading account assets(2): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 2 | Trading securities    
Fair value measurements    
Trading account assets(2): 12,377  
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3): 7,792 9,208
Fair Value, Measurements, Recurring | Level 2 | Privately issued    
Fair value measurements    
Securities available for sale(3): 874 694
Fair Value, Measurements, Recurring | Level 2 | Privately issued commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale(3): 944 822
Fair Value, Measurements, Recurring | Level 2 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3): 1,487 1,905
Fair Value, Measurements, Recurring | Level 2 | Other    
Fair value measurements    
Securities available for sale(3): 5 5
Fair Value, Measurements, Recurring | Level 2 | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 2 | Mortgage servicing rights    
Fair value measurements    
Other assets: 0  
Fair Value, Measurements, Recurring | Level 2 | Interest rate hedging contracts    
Fair value measurements    
Other assets: 4 2
Other liabilities:   149
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds    
Fair value measurements    
Trading account liabilities(2): 779 348
Fair Value, Measurements, Recurring | Level 2 | Other derivative contracts    
Fair value measurements    
Other assets: 0 2
Other liabilities: 16 3
Fair Value, Measurements, Recurring | Level 2 | Equity securities    
Fair value measurements    
Other assets: 0  
Fair Value, Measurements, Recurring | Level 3    
Fair value measurements    
Trading account assets(2):   139
Securities available for sale(3): 1,495 1,599
Other assets: 149 65
Total assets $ 1,694 $ 1,803
Percentage of total 6.00% 6.00%
Percentage of total Company assets 1.00% 1.00%
Trading account liabilities(2): $ 49 $ 138
FDIC clawback liability(2) 113 113
Other liabilities: 119 119
Total liabilities $ 168 $ 257
Percentage of total 3.00% 7.00%
Percentage of total Company liabilities 0.00% 0.00%
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury    
Fair value measurements    
Trading account assets(2): $ 0  
Securities available for sale(3): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 3 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 3 | State and municipal    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Commercial paper    
Fair value measurements    
Trading account assets(2): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Other    
Fair value measurements    
Securities available for sale(3): 96 $ 96
Fair Value, Measurements, Recurring | Level 3 | Corporate bonds    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities    
Fair value measurements    
Trading account assets(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Equity securities    
Fair value measurements    
Trading account assets(2): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Interest rate derivative contracts    
Fair value measurements    
Trading account assets(2): 1 1
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Commodity derivative contracts    
Fair value measurements    
Trading account assets(2): 0 0
Trading account liabilities(2): 0 0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets(2): 0 1
Trading account liabilities(2): 0 1
Fair Value, Measurements, Recurring | Level 3 | Equity derivative contracts    
Fair value measurements    
Trading account assets(2): 49 137
Trading account liabilities(2): 49 137
Fair Value, Measurements, Recurring | Level 3 | Trading securities    
Fair value measurements    
Trading account assets(2): 50  
Fair Value, Measurements, Recurring | Level 3 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 3 | Privately issued    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 3 | Privately issued commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 3 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 3 | Other    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 3 | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 1,399 1,503
Fair Value, Measurements, Recurring | Level 3 | Mortgage servicing rights    
Fair value measurements    
Other assets: 148 64
Fair Value, Measurements, Recurring | Level 3 | Interest rate hedging contracts    
Fair value measurements    
Other assets: 0  
Fair Value, Measurements, Recurring | Level 3 | Corporate bonds    
Fair value measurements    
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Other derivative contracts    
Fair value measurements    
Other assets: 1 1
Other liabilities: 6 6
Fair Value, Measurements, Recurring | Level 3 | Equity securities    
Fair value measurements    
Other assets: 0  
Fair Value, Measurements, Recurring | Fair Value    
Fair value measurements    
Trading account assets(2):   10,567
Securities available for sale(3): 16,017 17,563
Other assets: 163 67
Total assets 28,500 28,197
Trading account liabilities(2): 4,991 3,600
FDIC clawback liability(2) 113 113
Other liabilities: 123 119
Total liabilities 5,114 3,719
Fair Value, Measurements, Recurring | Fair Value | U.S. Treasury    
Fair value measurements    
Trading account assets(2): 2,773 1,926
Securities available for sale(3): 3,367 3,252
Trading account liabilities(2): 3,488 2,709
Fair Value, Measurements, Recurring | Fair Value | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2): 115 118
Fair Value, Measurements, Recurring | Fair Value | State and municipal    
Fair value measurements    
Trading account assets(2): 12 11
Fair Value, Measurements, Recurring | Fair Value | Commercial paper    
Fair value measurements    
Trading account assets(2): 31 7
Trading account liabilities(2): 35  
Fair Value, Measurements, Recurring | Fair Value | Other    
Fair value measurements    
Trading account assets(2):   8
Securities available for sale(3): 149 164
Trading account liabilities(2):   7
Fair Value, Measurements, Recurring | Fair Value | Corporate bonds    
Fair value measurements    
Trading account assets(2): 1,410 1,054
Fair Value, Measurements, Recurring | Fair Value | Asset-backed securities    
Fair value measurements    
Trading account assets(2): 318 199
Fair Value, Measurements, Recurring | Fair Value | Mortgage-backed securities    
Fair value measurements    
Trading account assets(2): 6,978 6,339
Fair Value, Measurements, Recurring | Fair Value | Equity securities    
Fair value measurements    
Trading account assets(2): 212 193
Securities available for sale(3):   10
Trading account liabilities(2): 101 35
Fair Value, Measurements, Recurring | Fair Value | Interest rate derivative contracts    
Fair value measurements    
Trading account assets(2): 333 525
Trading account liabilities(2): 445 264
Fair Value, Measurements, Recurring | Fair Value | Commodity derivative contracts    
Fair value measurements    
Trading account assets(2): 9 1
Trading account liabilities(2): 9 13
Fair Value, Measurements, Recurring | Fair Value | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets(2): 124 182
Trading account liabilities(2): 82 80
Fair Value, Measurements, Recurring | Fair Value | Equity derivative contracts    
Fair value measurements    
Trading account assets(2): 5 4
Trading account liabilities(2): 52 144
Fair Value, Measurements, Recurring | Fair Value | Trading securities    
Fair value measurements    
Trading account assets(2): 12,320  
Fair Value, Measurements, Recurring | Fair Value | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3): 7,792 9,208
Fair Value, Measurements, Recurring | Fair Value | Privately issued    
Fair value measurements    
Securities available for sale(3): 874 694
Fair Value, Measurements, Recurring | Fair Value | Privately issued commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale(3): 944 822
Fair Value, Measurements, Recurring | Fair Value | Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3): 1,487 1,905
Fair Value, Measurements, Recurring | Fair Value | Other    
Fair value measurements    
Securities available for sale(3): 5 5
Fair Value, Measurements, Recurring | Fair Value | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 1,399 1,503
Fair Value, Measurements, Recurring | Fair Value | Mortgage servicing rights    
Fair value measurements    
Other assets: 148 64
Fair Value, Measurements, Recurring | Fair Value | Interest rate hedging contracts    
Fair value measurements    
Other assets: 4 2
Other liabilities:   0
Fair Value, Measurements, Recurring | Fair Value | Corporate bonds    
Fair value measurements    
Trading account liabilities(2): 779 348
Fair Value, Measurements, Recurring | Fair Value | Other derivative contracts    
Fair value measurements    
Other assets: 1 1
Other liabilities: 10 $ 6
Fair Value, Measurements, Recurring | Fair Value | Equity securities    
Fair value measurements    
Other assets: $ 10  
[1] Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.
[2] Amounts represent the impact of legally enforceable master netting agreements between the same counterparties that allow the Company to net settle all contracts.