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Fair Value Measurement and Fair Value of Financial Instruments - Fair Value Measurements on a Recurring Basis (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Fair value measurements    
Trading account assets $ 11,213,000,000 $ 10,567,000,000
Securities available for sale 16,314,000,000  
Servicing Asset at Fair Value, Amount 159,000,000 64,000,000
Other liabilities 2,048,000,000 2,143,000,000
U.S. Treasury    
Fair value measurements    
Securities available for sale 3,429,000,000  
Other    
Fair value measurements    
Securities available for sale 184,000,000  
U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale 8,007,000,000  
Privately issued    
Fair value measurements    
Securities available for sale 864,000,000  
Collateralized loan obligations    
Fair value measurements    
Securities available for sale 1,474,000,000  
Other    
Fair value measurements    
Securities available for sale 4,000,000  
Direct bank purchase bonds    
Fair value measurements    
Securities available for sale 1,190,000,000  
Level 1    
Fair value measurements    
Other assets 48,000,000  
Other liabilities   0
Level 1 | U.S. Treasury    
Fair value measurements    
Securities available for sale   0
Trading account liabilities   0
Level 1 | Other    
Fair value measurements    
Trading account assets   0
Trading account liabilities   0
Level 1 | Corporate bonds    
Fair value measurements    
Trading account assets   0
Level 1 | Asset-backed securities    
Fair value measurements    
Trading account assets   0
Level 1 | Mortgage-backed securities    
Fair value measurements    
Trading account assets   0
Level 1 | Commodity derivative contracts    
Fair value measurements    
Trading account liabilities   0
Level 1 | Equity derivative contracts    
Fair value measurements    
Trading account liabilities   7,000,000
Level 1 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale   0
Level 1 | Privately issued    
Fair value measurements    
Securities available for sale   0
Level 1 | Privately issued - commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale   0
Level 1 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale   0
Level 1 | Mortgage servicing rights(2)    
Fair value measurements    
Other assets   0
Level 1 | Interest rate hedging contracts(3)    
Fair value measurements    
Other assets   0
Level 1 | Other derivative contracts(2)    
Fair value measurements    
Other assets   0
Other liabilities   0
Level 1 | Corporate bonds    
Fair value measurements    
Trading account liabilities   0
Level 2    
Fair value measurements    
Other assets 0  
Trading account liabilities   0
Level 2 | Equity derivative contracts    
Fair value measurements    
Trading account liabilities   0
Level 2 | Mortgage servicing rights(2)    
Fair value measurements    
Other assets   0
Level 3    
Fair value measurements    
Other assets 0  
Trading account liabilities   0
Other liabilities   0
Level 3 | U.S. Treasury    
Fair value measurements    
Securities available for sale   0
Trading account liabilities   0
Level 3 | Other    
Fair value measurements    
Trading account assets   0
Trading account liabilities   0
Level 3 | Corporate bonds    
Fair value measurements    
Trading account assets   0
Level 3 | Asset-backed securities    
Fair value measurements    
Trading account assets   0
Level 3 | Mortgage-backed securities    
Fair value measurements    
Trading account assets   0
Level 3 | Equity securities    
Fair value measurements    
Trading account assets   0
Level 3 | Interest rate derivative contracts    
Fair value measurements    
Trading account liabilities   0
Level 3 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale   0
Level 3 | Privately issued    
Fair value measurements    
Securities available for sale   0
Level 3 | Privately issued - commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale   0
Level 3 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale   0
Level 3 | Corporate bonds    
Fair value measurements    
Trading account liabilities   0
Fair Value, Measurements, Recurring    
Fair value measurements    
Trading account assets 11,213,000,000 10,567,000,000
Netting adjustment (354,000,000) (607,000,000)
Securities available for sale 16,314,000,000 17,563,000,000
Other assets 299,000,000 67,000,000
Total assets $ 27,826,000,000 $ 28,197,000,000
Percentage of total 100.00% 100.00%
Percentage of total 1.00% 2.00%
Percentage of total Company assets 17.00% 18.00%
Percentage of total Company assets (0.00%) (0.00%)
Trading account liabilities $ 4,027,000,000 $ 3,600,000,000
Netting adjustment (322,000,000) (620,000,000)
FDIC clawback liability(2)   113,000,000
Other liabilities 121,000,000 119,000,000
Total liabilities $ 4,148,000,000 $ 3,719,000,000
Percentage of total 100.00% 100.00%
Percentage of total 8.00% 17.00%
Percentage of total Company liabilities 3.00% 3.00%
Percentage of total Company liabilities (0.00%) (0.00%)
Fair Value, Measurements, Recurring | U.S. Treasury    
Fair value measurements    
Trading account assets $ 2,998,000,000 $ 1,926,000,000
Securities available for sale 3,429,000,000 3,252,000,000
Trading account liabilities 2,753,000,000 2,709,000,000
Fair Value, Measurements, Recurring | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets 73,000,000 118,000,000
Fair Value, Measurements, Recurring | State and municipal securities    
Fair value measurements    
Trading account assets 10,000,000 11,000,000
Fair Value, Measurements, Recurring | Commercial paper    
Fair value measurements    
Trading account assets 51,000,000 7,000,000
Trading account liabilities 10,000,000  
Fair Value, Measurements, Recurring | Other    
Fair value measurements    
Trading account assets   8,000,000
Securities available for sale 184,000,000 164,000,000
Trading account liabilities   7,000,000
Fair Value, Measurements, Recurring | Corporate bonds    
Fair value measurements    
Trading account assets 1,367,000,000 1,054,000,000
Fair Value, Measurements, Recurring | Asset-backed securities    
Fair value measurements    
Trading account assets 299,000,000 199,000,000
Fair Value, Measurements, Recurring | Mortgage-backed securities    
Fair value measurements    
Trading account assets 5,785,000,000 6,339,000,000
Fair Value, Measurements, Recurring | Equity securities    
Fair value measurements    
Trading account assets 127,000,000 193,000,000
Securities available for sale   10,000,000
Trading account liabilities 70,000,000 35,000,000
Fair Value, Measurements, Recurring | Interest rate derivative contracts    
Fair value measurements    
Trading account assets 401,000,000 525,000,000
Netting adjustment (130,000,000) (353,000,000)
Trading account liabilities 338,000,000 264,000,000
Netting adjustment (262,000,000) (382,000,000)
Fair Value, Measurements, Recurring | Commodity derivative contracts    
Fair value measurements    
Trading account assets 1,000,000 1,000,000
Netting adjustment (24,000,000) (49,000,000)
Trading account liabilities 14,000,000 13,000,000
Netting adjustment (4,000,000) (20,000,000)
Fair Value, Measurements, Recurring | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets 90,000,000 182,000,000
Netting adjustment (170,000,000) (68,000,000)
Trading account liabilities 112,000,000 80,000,000
Netting adjustment (56,000,000) (66,000,000)
Fair Value, Measurements, Recurring | Equity derivative contracts    
Fair value measurements    
Trading account assets 11,000,000 4,000,000
Netting adjustment (11,000,000) (135,000,000)
Trading account liabilities 13,000,000 144,000,000
Netting adjustment 0  
Fair Value, Measurements, Recurring | Trading Securities    
Fair value measurements    
Netting adjustment (335,000,000) (605,000,000)
Netting adjustment (322,000,000) (468,000,000)
Fair Value, Measurements, Recurring | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale 8,007,000,000 9,208,000,000
Fair Value, Measurements, Recurring | Privately issued    
Fair value measurements    
Securities available for sale 864,000,000 694,000,000
Fair Value, Measurements, Recurring | Privately issued - commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale 1,162,000,000 822,000,000
Fair Value, Measurements, Recurring | Collateralized loan obligations    
Fair value measurements    
Securities available for sale 1,474,000,000 1,905,000,000
Fair Value, Measurements, Recurring | Other    
Fair value measurements    
Netting adjustment (19,000,000) (2,000,000)
Securities available for sale 4,000,000 5,000,000
Netting adjustment 0 (152,000,000)
Fair Value, Measurements, Recurring | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale 1,190,000,000 1,503,000,000
Fair Value, Measurements, Recurring | Mortgage servicing rights(2)    
Fair value measurements    
Other assets 159,000,000 64,000,000
Fair Value, Measurements, Recurring | loans held for sale [Domain]    
Fair value measurements    
Other assets 117,000,000  
Fair Value, Measurements, Recurring | Interest rate hedging contracts(3)    
Fair value measurements    
Netting adjustment (3,000,000) 0
Other assets 3,000,000 2,000,000
Netting adjustment   (149,000,000)
Other liabilities   0
Fair Value, Measurements, Recurring | Other derivative contracts(2)    
Fair value measurements    
Netting adjustment (16,000,000) (2,000,000)
Other assets 11,000,000 1,000,000
Netting adjustment 0 (3,000,000)
Other liabilities 5,000,000 6,000,000
Fair Value, Measurements, Recurring | Equity Securities, FV-NI [Member]    
Fair value measurements    
Netting adjustment 0  
Other assets 9,000,000  
Fair Value, Measurements, Recurring | Corporate bonds    
Fair value measurements    
Trading account liabilities 717,000,000 348,000,000
Fair Value, Measurements, Recurring | Level 1    
Fair value measurements    
Trading account assets 146,000,000 202,000,000
Securities available for sale 0 10,000,000
Other assets 9,000,000  
Total assets $ 155,000,000 $ 212,000,000
Percentage of total 0.00% 1.00%
Percentage of total Company assets 0.00% 0.00%
Trading account liabilities $ 125,000,000 $ 46,000,000
FDIC clawback liability(2)   0
Total liabilities $ 125,000,000 $ 46,000,000
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 $ 0 $ 0
Securities available for sale 0  
Trading account liabilities 0  
Fair Value, Measurements, Recurring | Level 1 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets 0 0
Fair Value, Measurements, Recurring | Level 1 | State and municipal securities    
Fair value measurements    
Trading account assets 0 0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper    
Fair value measurements    
Trading account assets 0 0
Fair Value, Measurements, Recurring | Level 1 | Other    
Fair value measurements    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds    
Fair value measurements    
Trading account assets 0  
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities    
Fair value measurements    
Trading account assets 0  
Fair Value, Measurements, Recurring | Level 1 | Mortgage-backed securities    
Fair value measurements    
Trading account assets 0  
Fair Value, Measurements, Recurring | Level 1 | Equity securities    
Fair value measurements    
Trading account assets 127,000,000 193,000,000
Securities available for sale   10,000,000
Trading account liabilities 70,000,000 35,000,000
Fair Value, Measurements, Recurring | Level 1 | Interest rate derivative contracts    
Fair value measurements    
Trading account assets 9,000,000 7,000,000
Trading account liabilities 55,000,000 3,000,000
Fair Value, Measurements, Recurring | Level 1 | Commodity derivative contracts    
Fair value measurements    
Trading account assets 0 0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets 1,000,000 0
Trading account liabilities 0 1,000,000
Fair Value, Measurements, Recurring | Level 1 | Equity derivative contracts    
Fair value measurements    
Trading account assets 9,000,000 2,000,000
Trading account liabilities 0  
Fair Value, Measurements, Recurring | Level 1 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale 0  
Fair Value, Measurements, Recurring | Level 1 | Privately issued    
Fair value measurements    
Securities available for sale 0  
Fair Value, Measurements, Recurring | Level 1 | Privately issued - commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale 0  
Fair Value, Measurements, Recurring | Level 1 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale 0  
Fair Value, Measurements, Recurring | Level 1 | Other    
Fair value measurements    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Mortgage servicing rights(2)    
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(3)    
Fair value measurements    
Other assets 0  
Fair Value, Measurements, Recurring | Level 1 | Other derivative contracts(2)    
Fair value measurements    
Other assets 0  
Fair Value, Measurements, Recurring | Level 1 | Equity Securities, FV-NI [Member]    
Fair value measurements    
Other assets 9,000,000  
Fair Value, Measurements, Recurring | Level 1 | Corporate bonds    
Fair value measurements    
Trading account liabilities 0  
Fair Value, Measurements, Recurring | Level 2    
Fair value measurements    
Trading account assets 11,389,000,000 10,831,000,000
Securities available for sale 14,983,000,000 15,954,000,000
Other assets 32,000,000 4,000,000
Total assets $ 26,404,000,000 $ 26,789,000,000
Percentage of total 95.00% 95.00%
Percentage of total Company assets 16.00% 17.00%
Trading account liabilities $ 4,211,000,000 $ 3,884,000,000
FDIC clawback liability(2)   0
Other liabilities 3,000,000 152,000,000
Total liabilities $ 4,214,000,000 $ 4,036,000,000
Percentage of total 102.00% 109.00%
Percentage of total Company liabilities 3.00% 3.00%
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury    
Fair value measurements    
Trading account assets $ 2,998,000,000 $ 1,926,000,000
Securities available for sale 3,429,000,000 3,252,000,000
Trading account liabilities 2,753,000,000 2,709,000,000
Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets 73,000,000 118,000,000
Fair Value, Measurements, Recurring | Level 2 | State and municipal securities    
Fair value measurements    
Trading account assets 10,000,000 11,000,000
Fair Value, Measurements, Recurring | Level 2 | Commercial paper    
Fair value measurements    
Trading account assets 51,000,000 7,000,000
Trading account liabilities 10,000,000  
Fair Value, Measurements, Recurring | Level 2 | Other    
Fair value measurements    
Trading account assets   8,000,000
Securities available for sale 43,000,000 68,000,000
Trading account liabilities   7,000,000
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds    
Fair value measurements    
Trading account assets 1,367,000,000 1,054,000,000
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Fair value measurements    
Trading account assets 299,000,000 199,000,000
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities    
Fair value measurements    
Trading account assets 5,785,000,000 6,339,000,000
Fair Value, Measurements, Recurring | Level 2 | Equity securities    
Fair value measurements    
Trading account assets 0  
Securities available for sale   0
Fair Value, Measurements, Recurring | Level 2 | Interest rate derivative contracts    
Fair value measurements    
Trading account assets 522,000,000 870,000,000
Trading account liabilities 545,000,000 643,000,000
Fair Value, Measurements, Recurring | Level 2 | Commodity derivative contracts    
Fair value measurements    
Trading account assets 25,000,000 50,000,000
Trading account liabilities 18,000,000 33,000,000
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets 259,000,000 249,000,000
Trading account liabilities 168,000,000 144,000,000
Fair Value, Measurements, Recurring | Level 2 | Equity derivative contracts    
Fair value measurements    
Trading account assets 0 0
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale 8,007,000,000 9,208,000,000
Fair Value, Measurements, Recurring | Level 2 | Privately issued    
Fair value measurements    
Securities available for sale 864,000,000 694,000,000
Fair Value, Measurements, Recurring | Level 2 | Privately issued - commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale 1,162,000,000 822,000,000
Fair Value, Measurements, Recurring | Level 2 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale 1,474,000,000 1,905,000,000
Fair Value, Measurements, Recurring | Level 2 | Other    
Fair value measurements    
Securities available for sale 4,000,000 5,000,000
Fair Value, Measurements, Recurring | Level 2 | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 2 | Mortgage servicing rights(2)    
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(3)    
Fair value measurements    
Other assets 6,000,000 2,000,000
Other liabilities   149,000,000
Fair Value, Measurements, Recurring | Level 2 | Other derivative contracts(2)    
Fair value measurements    
Other assets 26,000,000 2,000,000
Other liabilities 3,000,000 3,000,000
Fair Value, Measurements, Recurring | Level 2 | Equity Securities, FV-NI [Member]    
Fair value measurements    
Other assets 0  
Fair Value, Measurements, Recurring | Level 2 | Corporate bonds    
Fair value measurements    
Trading account liabilities 717,000,000 348,000,000
Fair Value, Measurements, Recurring | Level 3    
Fair value measurements    
Trading account assets 13,000,000 139,000,000
Securities available for sale 1,331,000,000 1,599,000,000
Other assets 277,000,000 65,000,000
Total assets $ 1,621,000,000 $ 1,803,000,000
Percentage of total 6.00% 6.00%
Percentage of total Company assets 1.00% 1.00%
Trading account liabilities $ 13,000,000 $ 138,000,000
FDIC clawback liability(2)   113,000,000
Other liabilities 118,000,000 119,000,000
Total liabilities $ 131,000,000 $ 257,000,000
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 $ 0 $ 0
Securities available for sale 0  
Fair Value, Measurements, Recurring | Level 3 | U.S. government-sponsored agency securities    
Fair value measurements    
Trading account assets 0 0
Fair Value, Measurements, Recurring | Level 3 | State and municipal securities    
Fair value measurements    
Trading account assets 0 0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper    
Fair value measurements    
Trading account assets 0 0
Fair Value, Measurements, Recurring | Level 3 | Other    
Fair value measurements    
Securities available for sale 141,000,000 96,000,000
Fair Value, Measurements, Recurring | Level 3 | Corporate bonds    
Fair value measurements    
Trading account assets 0  
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Fair value measurements    
Trading account assets 0  
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities    
Fair value measurements    
Trading account assets 0  
Fair Value, Measurements, Recurring | Level 3 | Equity securities    
Fair value measurements    
Trading account assets 0  
Securities available for sale   0
Fair Value, Measurements, Recurring | Level 3 | Interest rate derivative contracts    
Fair value measurements    
Trading account assets 0 1,000,000
Fair Value, Measurements, Recurring | Level 3 | Commodity derivative contracts    
Fair value measurements    
Trading account assets 0 0
Trading account liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange derivative contracts    
Fair value measurements    
Trading account assets 0 1,000,000
Trading account liabilities 0 1,000,000
Fair Value, Measurements, Recurring | Level 3 | Equity derivative contracts    
Fair value measurements    
Trading account assets 13,000,000 137,000,000
Trading account liabilities 13,000,000 137,000,000
Fair Value, Measurements, Recurring | Level 3 | Fdic    
Fair value measurements    
Other liabilities 116,000,000  
Fair Value, Measurements, Recurring | Level 3 | U.S. government agency and government-sponsored agencies    
Fair value measurements    
Securities available for sale 0  
Fair Value, Measurements, Recurring | Level 3 | Privately issued    
Fair value measurements    
Securities available for sale 0  
Fair Value, Measurements, Recurring | Level 3 | Privately issued - commercial mortgage-backed securities    
Fair value measurements    
Securities available for sale 0  
Fair Value, Measurements, Recurring | Level 3 | Collateralized loan obligations    
Fair value measurements    
Securities available for sale 0  
Fair Value, Measurements, Recurring | Level 3 | Other    
Fair value measurements    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3 | Direct bank purchase bonds    
Fair value measurements    
Securities available for sale 1,190,000,000 1,503,000,000
Fair Value, Measurements, Recurring | Level 3 | loans held for sale [Domain]    
Fair value measurements    
Other assets 117,000,000  
Fair Value, Measurements, Recurring | Level 3 | Interest rate hedging contracts(3)    
Fair value measurements    
Other assets 0 0
Fair Value, Measurements, Recurring | Level 3 | Other derivative contracts(2)    
Fair value measurements    
Other assets 1,000,000 1,000,000
Other liabilities 2,000,000 $ 6,000,000
Fair Value, Measurements, Recurring | Level 3 | Equity Securities, FV-NI [Member]    
Fair value measurements    
Other assets 0  
Fdic | Fair Value, Measurements, Recurring    
Fair value measurements    
Other liabilities $ 116,000,000