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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 ($)
Mar. 31, 2019
Dec. 31, 2018
Fair value measurements    
Trading account assets(2): $ 10,889,000,000 $ 11,213,000,000
Securities available for sale(3): 17,807,000,000  
U.S. Treasury    
Fair value measurements    
Securities available for sale(3): 3,486,000,000  
US Government Agencies Debt Securities [Member]    
Fair value measurements    
Securities available for sale(3): 1,000,000  
Other    
Fair value measurements    
Securities available for sale(3): 182,000,000  
U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3): 9,087,000,000  
Privately issued    
Fair value measurements    
Securities available for sale(3): 932,000,000  
Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3): 1,538,000,000  
Other    
Fair value measurements    
Securities available for sale(3): 4,000,000  
Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 1,124,000,000  
Level 1    
Fair value measurements    
Other assets:   9,000,000
Other liabilities:   0
Level 1 | U.S. Treasury    
Fair value measurements    
Securities available for sale(3):   0
Trading account liabilities(2):   0
Level 1 | Commercial paper    
Fair value measurements    
Trading account liabilities(2):   0
Level 1 | Other    
Fair value measurements    
Trading account assets(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 | Equity securities    
Fair value measurements    
Other assets:   9,000,000
Level 1 | Commodity derivative contracts    
Fair value measurements    
Trading account liabilities(2):   0
Level 1 | Equity derivative contracts    
Fair value measurements    
Trading account liabilities(2):   0
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 | Mortgage servicing rights    
Fair value measurements    
Other assets:   0
Level 1 | loans held for sale [Domain]    
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    
Trading account liabilities(2):   0
Level 2 | Equity securities    
Fair value measurements    
Trading account assets(2):   0
Level 2 | Equity derivative contracts    
Fair value measurements    
Trading account liabilities(2):   0
Level 2 | Mortgage servicing rights    
Fair value measurements    
Other assets:   0
Level 2 | loans held for sale [Domain]    
Fair value measurements    
Other assets:   0
Level 3    
Fair value measurements    
Trading account liabilities(2):   0
Level 3 | U.S. Treasury    
Fair value measurements    
Securities available for sale(3):   0
Trading account liabilities(2):   0
Level 3 | Commercial paper    
Fair value measurements    
Trading account liabilities(2):   0
Level 3 | Other    
Fair value measurements    
Trading account assets(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
Level 3 | Interest rate derivative contracts    
Fair value measurements    
Trading account liabilities(2):   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 | Mortgage servicing rights    
Fair value measurements    
Other assets:   159,000,000
Level 3 | loans held for sale [Domain]    
Fair value measurements    
Other assets:   117,000,000
Level 3 | Corporate bonds    
Fair value measurements    
Trading account liabilities(2):   0
Fair Value, Measurements, Recurring    
Fair value measurements    
Netting Adjustment $ (351,000,000) [1] $ (354,000,000) [2]
Percentage of total 100.00% 100.00%
Netting Adjustment 1.00% 2.00%
Percentage of total Company assets 17.00% 17.00%
Netting Adjustment (0.00%) (0.00%)
Netting Adjustment $ (323,000,000) [1] $ (322,000,000) [2]
Percentage of total 100.00% 100.00%
Netting Adjustment 8.00% 8.00%
Percentage of total Company liabilities 3.00% 3.00%
Netting Adjustment (0.00%) (0.00%)
Fair Value, Measurements, Recurring | Equity securities    
Fair value measurements    
Netting Adjustment   $ 0
Fair Value, Measurements, Recurring | Interest rate derivative contracts    
Fair value measurements    
Netting Adjustment $ (127,000,000) (130,000,000)
Netting Adjustment (284,000,000) (262,000,000)
Fair Value, Measurements, Recurring | Commodity derivative contracts    
Fair value measurements    
Netting Adjustment (15,000,000) (24,000,000)
Netting Adjustment (7,000,000) (4,000,000)
Fair Value, Measurements, Recurring | Foreign exchange derivative contracts    
Fair value measurements    
Netting Adjustment (177,000,000) (170,000,000)
Netting Adjustment (30,000,000) (56,000,000)
Fair Value, Measurements, Recurring | Equity derivative contracts    
Fair value measurements    
Netting Adjustment (11,000,000) (11,000,000)
Netting Adjustment 0  
Fair Value, Measurements, Recurring | Other Contract [Member]    
Fair value measurements    
Netting Adjustment 0  
Netting Adjustment 0  
Fair Value, Measurements, Recurring | Trading securities    
Fair value measurements    
Netting Adjustment (330,000,000) [1] (335,000,000) [2]
Netting Adjustment (321,000,000) [1] (322,000,000) [2]
Fair Value, Measurements, Recurring | Other    
Fair value measurements    
Netting Adjustment [2] (21,000,000) (19,000,000)
Fair Value, Measurements, Recurring | Interest rate hedging contracts    
Fair value measurements    
Netting Adjustment (17,000,000) (3,000,000)
Fair Value, Measurements, Recurring | Other derivative contracts    
Fair value measurements    
Netting Adjustment (4,000,000) (16,000,000)
Netting Adjustment (2,000,000) 0
Fair Value, Measurements, Recurring | Equity securities    
Fair value measurements    
Netting Adjustment 0  
Fair Value, Measurements, Recurring | Total other liabilities    
Fair value measurements    
Netting Adjustment (2,000,000) [1] 0 [2]
Fair Value, Measurements, Recurring | Level 1    
Fair value measurements    
Trading account assets(2):   146,000,000
Securities available for sale(3): 9,000,000 0
Other assets: 10,000,000  
Total assets $ 95,000,000 $ 155,000,000
Percentage of total 0.00% 1.00%
Percentage of total Company assets 0.00% 0.00%
Trading account liabilities(2): $ 107,000,000 $ 125,000,000
Fdic Clawback   0
Other liabilities: 0  
Total liabilities $ 107,000,000 $ 125,000,000
Percentage of total 3.00% 3.00%
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 $ 0
Securities available for sale(3): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 1 | US Government Agencies Debt Securities [Member]    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 1 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2): 0 0
Fair Value, Measurements, Recurring | Level 1 | State and municipal    
Fair value measurements    
Trading account assets(2): 0 0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper    
Fair value measurements    
Trading account assets(2): 0 0
Fair Value, Measurements, Recurring | Level 1 | Other    
Fair value measurements    
Securities available for sale(3): 9,000,000 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): 67,000,000 127,000,000
Trading account liabilities(2): 74,000,000 70,000,000
Fair Value, Measurements, Recurring | Level 1 | Interest rate derivative contracts    
Fair value measurements    
Trading account assets(2): 8,000,000 9,000,000
Trading account liabilities(2): 33,000,000 55,000,000
Fair Value, Measurements, Recurring | Level 1 | Commodity derivative contracts    
Fair value measurements    
Trading account assets(2): 0 0
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets(2): 1,000,000 1,000,000
Trading account liabilities(2): 0 0
Fair Value, Measurements, Recurring | Level 1 | Equity derivative contracts    
Fair value measurements    
Trading account assets(2): 0 9,000,000
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Other Contract [Member]    
Fair value measurements    
Trading account assets(2): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 1 | Trading securities    
Fair value measurements    
Trading account assets(2): 76,000,000  
Fair Value, Measurements, Recurring | Level 1 | Fdic [Member]    
Fair value measurements    
Other liabilities: 0  
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 0
Fair Value, Measurements, Recurring | Level 1 | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 0 0
Fair Value, Measurements, Recurring | Level 1 | Mortgage servicing rights    
Fair value measurements    
Other assets: 0  
Fair Value, Measurements, Recurring | Level 1 | loans held for sale [Domain]    
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: 10,000,000  
Fair Value, Measurements, Recurring | Level 2    
Fair value measurements    
Trading account assets(2):   11,389,000,000
Securities available for sale(3): 16,530,000,000 14,983,000,000
Other assets: 28,000,000 32,000,000
Total assets $ 27,689,000,000 $ 26,404,000,000
Percentage of total 95.00% 95.00%
Percentage of total Company assets 16.00% 16.00%
Trading account liabilities(2): $ 4,098,000,000 $ 4,211,000,000
Fdic Clawback   0
Other liabilities: 3,000,000 3,000,000
Total liabilities $ 4,101,000,000 $ 4,214,000,000
Percentage of total 102.00% 102.00%
Percentage of total Company liabilities 3.00% 3.00%
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury    
Fair value measurements    
Trading account assets(2): $ 3,606,000,000 $ 2,998,000,000
Securities available for sale(3): 3,486,000,000 3,429,000,000
Trading account liabilities(2): 2,800,000,000 2,753,000,000
Fair Value, Measurements, Recurring | Level 2 | US Government Agencies Debt Securities [Member]    
Fair value measurements    
Securities available for sale(3): 1,000,000  
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2): 37,000,000 73,000,000
Fair Value, Measurements, Recurring | Level 2 | State and municipal    
Fair value measurements    
Trading account assets(2): 13,000,000 10,000,000
Fair Value, Measurements, Recurring | Level 2 | Commercial paper    
Fair value measurements    
Trading account assets(2): 303,000,000 51,000,000
Trading account liabilities(2):   10,000,000
Fair Value, Measurements, Recurring | Level 2 | Other    
Fair value measurements    
Trading account assets(2):   0
Securities available for sale(3): 29,000,000 43,000,000
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds    
Fair value measurements    
Trading account assets(2): 1,691,000,000 1,367,000,000
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Fair value measurements    
Trading account assets(2): 230,000,000 299,000,000
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities    
Fair value measurements    
Trading account assets(2): 4,277,000,000 5,785,000,000
Fair Value, Measurements, Recurring | Level 2 | Equity securities    
Fair value measurements    
Trading account assets(2): 0  
Other assets:   0
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 2 | Interest rate derivative contracts    
Fair value measurements    
Trading account assets(2): 705,000,000 522,000,000
Trading account liabilities(2): 484,000,000 545,000,000
Fair Value, Measurements, Recurring | Level 2 | Commodity derivative contracts    
Fair value measurements    
Trading account assets(2): 18,000,000 25,000,000
Trading account liabilities(2): 13,000,000 18,000,000
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets(2): 250,000,000 259,000,000
Trading account liabilities(2): 157,000,000 168,000,000
Fair Value, Measurements, Recurring | Level 2 | Equity derivative contracts    
Fair value measurements    
Trading account assets(2): 0 0
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 2 | Other Contract [Member]    
Fair value measurements    
Trading account assets(2): 1,000,000  
Trading account liabilities(2): 1,000,000  
Fair Value, Measurements, Recurring | Level 2 | Trading securities    
Fair value measurements    
Trading account assets(2): 11,131,000,000  
Fair Value, Measurements, Recurring | Level 2 | Fdic [Member]    
Fair value measurements    
Other liabilities: 0  
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3): 9,087,000,000 8,007,000,000
Fair Value, Measurements, Recurring | Level 2 | Privately issued    
Fair value measurements    
Securities available for sale(3): 932,000,000 864,000,000
Fair Value, Measurements, Recurring | Level 2 | Privately issued commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale(3): 1,453,000,000 1,162,000,000
Fair Value, Measurements, Recurring | Level 2 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3): 1,538,000,000 1,474,000,000
Fair Value, Measurements, Recurring | Level 2 | Other    
Fair value measurements    
Securities available for sale(3): 4,000,000 4,000,000
Fair Value, Measurements, Recurring | Level 2 | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 0 0
Fair Value, Measurements, Recurring | Level 2 | Mortgage servicing rights    
Fair value measurements    
Other assets: 0  
Fair Value, Measurements, Recurring | Level 2 | loans held for sale [Domain]    
Fair value measurements    
Other assets: 0  
Fair Value, Measurements, Recurring | Level 2 | Interest rate hedging contracts    
Fair value measurements    
Other assets: 20,000,000 6,000,000
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds    
Fair value measurements    
Trading account liabilities(2): 643,000,000 717,000,000
Fair Value, Measurements, Recurring | Level 2 | Other derivative contracts    
Fair value measurements    
Other assets: 8,000,000 26,000,000
Other liabilities: 3,000,000 3,000,000
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):   13,000,000
Securities available for sale(3): 1,268,000,000 1,331,000,000
Other assets: 386,000,000 277,000,000
Total assets $ 1,666,000,000 $ 1,621,000,000
Percentage of total 6.00% 6.00%
Percentage of total Company assets 1.00% 1.00%
Trading account liabilities(2): $ 12,000,000 $ 13,000,000
Fdic Clawback   116,000,000
Other liabilities: 119,000,000 118,000,000
Total liabilities $ 131,000,000 $ 131,000,000
Percentage of total 3.00% 3.00%
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 $ 0
Securities available for sale(3): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 3 | US Government Agencies Debt Securities [Member]    
Fair value measurements    
Securities available for sale(3): 0  
Fair Value, Measurements, Recurring | Level 3 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2): 0 0
Fair Value, Measurements, Recurring | Level 3 | State and municipal    
Fair value measurements    
Trading account assets(2): 0 0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper    
Fair value measurements    
Trading account assets(2): 0 0
Fair Value, Measurements, Recurring | Level 3 | Other    
Fair value measurements    
Securities available for sale(3): 144,000,000 141,000,000
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  
Other assets:   0
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Interest rate derivative contracts    
Fair value measurements    
Trading account assets(2): 0 0
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 0
Trading account liabilities(2): 0 0
Fair Value, Measurements, Recurring | Level 3 | Equity derivative contracts    
Fair value measurements    
Trading account assets(2): 12,000,000 13,000,000
Trading account liabilities(2): 12,000,000 13,000,000
Fair Value, Measurements, Recurring | Level 3 | Other Contract [Member]    
Fair value measurements    
Trading account assets(2): 0  
Trading account liabilities(2): 0  
Fair Value, Measurements, Recurring | Level 3 | Trading securities    
Fair value measurements    
Trading account assets(2): 12,000,000  
Fair Value, Measurements, Recurring | Level 3 | Fdic [Member]    
Fair value measurements    
Other liabilities: 117,000,000  
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 0
Fair Value, Measurements, Recurring | Level 3 | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 1,124,000,000 1,190,000,000
Fair Value, Measurements, Recurring | Level 3 | Mortgage servicing rights    
Fair value measurements    
Other assets: 263,000,000  
Fair Value, Measurements, Recurring | Level 3 | loans held for sale [Domain]    
Fair value measurements    
Other assets: 121,000,000  
Fair Value, Measurements, Recurring | Level 3 | Interest rate hedging contracts    
Fair value measurements    
Other assets: 0 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: 2,000,000 1,000,000
Other liabilities: 2,000,000 2,000,000
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):   11,213,000,000
Securities available for sale(3): 17,807,000,000 16,314,000,000
Other assets: 403,000,000 299,000,000
Total assets 29,099,000,000 27,826,000,000
Trading account liabilities(2): 3,896,000,000 4,027,000,000
Fdic Clawback   116,000,000
Other liabilities: 120,000,000 121,000,000
Total liabilities 4,016,000,000 4,148,000,000
Fair Value, Measurements, Recurring | Fair Value | U.S. Treasury    
Fair value measurements    
Trading account assets(2): 3,606,000,000 2,998,000,000
Securities available for sale(3): 3,486,000,000 3,429,000,000
Trading account liabilities(2): 2,800,000,000 2,753,000,000
Fair Value, Measurements, Recurring | Fair Value | US Government Agencies Debt Securities [Member]    
Fair value measurements    
Securities available for sale(3): 1,000,000  
Fair Value, Measurements, Recurring | Fair Value | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets(2): 37,000,000 73,000,000
Fair Value, Measurements, Recurring | Fair Value | State and municipal    
Fair value measurements    
Trading account assets(2): 13,000,000 10,000,000
Fair Value, Measurements, Recurring | Fair Value | Commercial paper    
Fair value measurements    
Trading account assets(2): 303,000,000 51,000,000
Trading account liabilities(2):   10,000,000
Fair Value, Measurements, Recurring | Fair Value | Other    
Fair value measurements    
Trading account assets(2):   0
Securities available for sale(3): 182,000,000 184,000,000
Fair Value, Measurements, Recurring | Fair Value | Corporate bonds    
Fair value measurements    
Trading account assets(2): 1,691,000,000 1,367,000,000
Fair Value, Measurements, Recurring | Fair Value | Asset-backed securities    
Fair value measurements    
Trading account assets(2): 230,000,000 299,000,000
Fair Value, Measurements, Recurring | Fair Value | Mortgage-backed securities    
Fair value measurements    
Trading account assets(2): 4,277,000,000 5,785,000,000
Fair Value, Measurements, Recurring | Fair Value | Equity securities    
Fair value measurements    
Trading account assets(2): 67,000,000 127,000,000
Other assets:   9,000,000
Trading account liabilities(2): 74,000,000 70,000,000
Fair Value, Measurements, Recurring | Fair Value | Interest rate derivative contracts    
Fair value measurements    
Trading account assets(2): 586,000,000 401,000,000
Trading account liabilities(2): 233,000,000 338,000,000
Fair Value, Measurements, Recurring | Fair Value | Commodity derivative contracts    
Fair value measurements    
Trading account assets(2): 3,000,000 1,000,000
Trading account liabilities(2): 6,000,000 14,000,000
Fair Value, Measurements, Recurring | Fair Value | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets(2): 74,000,000 90,000,000
Trading account liabilities(2): 127,000,000 112,000,000
Fair Value, Measurements, Recurring | Fair Value | Equity derivative contracts    
Fair value measurements    
Trading account assets(2): 1,000,000 11,000,000
Trading account liabilities(2): 12,000,000 13,000,000
Fair Value, Measurements, Recurring | Fair Value | Other Contract [Member]    
Fair value measurements    
Trading account assets(2): 1,000,000  
Trading account liabilities(2): 1,000,000  
Fair Value, Measurements, Recurring | Fair Value | Trading securities    
Fair value measurements    
Trading account assets(2): 10,889,000,000  
Fair Value, Measurements, Recurring | Fair Value | Fdic [Member]    
Fair value measurements    
Other liabilities: 117,000,000  
Fair Value, Measurements, Recurring | Fair Value | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale(3): 9,087,000,000 8,007,000,000
Fair Value, Measurements, Recurring | Fair Value | Privately issued    
Fair value measurements    
Securities available for sale(3): 932,000,000 864,000,000
Fair Value, Measurements, Recurring | Fair Value | Privately issued commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale(3): 1,453,000,000 1,162,000,000
Fair Value, Measurements, Recurring | Fair Value | Collateralized loan obligations    
Fair value measurements    
Securities available for sale(3): 1,538,000,000 1,474,000,000
Fair Value, Measurements, Recurring | Fair Value | Other    
Fair value measurements    
Securities available for sale(3): 4,000,000 4,000,000
Fair Value, Measurements, Recurring | Fair Value | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale(3): 1,124,000,000 1,190,000,000
Fair Value, Measurements, Recurring | Fair Value | Mortgage servicing rights    
Fair value measurements    
Other assets: 263,000,000 159,000,000
Fair Value, Measurements, Recurring | Fair Value | loans held for sale [Domain]    
Fair value measurements    
Other assets: 121,000,000 117,000,000
Fair Value, Measurements, Recurring | Fair Value | Interest rate hedging contracts    
Fair value measurements    
Other assets: 3,000,000 3,000,000
Fair Value, Measurements, Recurring | Fair Value | Corporate bonds    
Fair value measurements    
Trading account liabilities(2): 643,000,000 717,000,000
Fair Value, Measurements, Recurring | Fair Value | Other derivative contracts    
Fair value measurements    
Other assets: 6,000,000 11,000,000
Other liabilities: 3,000,000 $ 5,000,000
Fair Value, Measurements, Recurring | Fair Value | Equity securities    
Fair value measurements    
Other assets: $ 10,000,000  
[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.