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Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets $ 41,459 $ 41,167
Gross Balance, Liabilities 435 365
Level 1 [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 40
Level 1 [Member] | Deposits in domestic offices
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [1] 0 [1]
Level 1 [Member] | Trading Liabilities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 367 308
Level 1 [Member] | Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 68 [2] 57 [2]
Level 1 [Member] | Derivatives [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 33 [2] 34 [2]
Level 1 [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 11 [2] 16 [2]
Level 1 [Member] | Derivatives [Member] | Equity contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [2] 0 [2]
Level 1 [Member] | Derivatives [Member] | Precious metals contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 24 [2] 7 [2]
Level 1 [Member] | Derivatives [Member] | Credit contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [2] 0 [2]
Level 1 [Member] | Derivatives [Member] | Derivatives netting [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [2] 0 [2]
Level 1 [Member] | Long-term Debt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [3] 0 [3]
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Precious metals [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 2,140 1,344
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Obligations of U.S. States and political subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Collateralized debt obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Student Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 166 [2] 270 [2]
Level 1 [Member] | Derivatives [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 88 [2] 81 [2]
Level 1 [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 26 [2] 7 [2]
Level 1 [Member] | Derivatives [Member] | Equity contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [2] 0 [2]
Level 1 [Member] | Derivatives [Member] | Precious metals contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 52 [2] 182 [2]
Level 1 [Member] | Derivatives [Member] | Credit contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [2] 0 [2]
Level 1 [Member] | Derivatives [Member] | Derivatives netting [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [2] 0 [2]
Level 1 [Member] | Securities available-for-sale [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 39,153 39,513
Level 1 [Member] | Securities available-for-sale [Member] | Obligations of U.S. States and political subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Commercial mortgages [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Home Equity Line of Credit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Others [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [4] 0 [4]
Level 1 [Member] | Mortgage servicing rights [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [5] 0 [5]
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 104,222 113,315
Gross Balance, Liabilities 86,644 93,424
Level 2 [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 163 162
Level 2 [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 874 881
Level 2 [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 3,772 3,681
Level 2 [Member] | Deposits in domestic offices
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 5,393 [1] 5,406 [1]
Level 2 [Member] | Trading Liabilities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 3,993 3,826
Level 2 [Member] | Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 70,299 [2] 77,506 [2]
Level 2 [Member] | Derivatives [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 51,348 [2] 56,282 [2]
Level 2 [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 12,541 [2] 14,576 [2]
Level 2 [Member] | Derivatives [Member] | Equity contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 1,312 [2] 1,403 [2]
Level 2 [Member] | Derivatives [Member] | Precious metals contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 817 [2] 847 [2]
Level 2 [Member] | Derivatives [Member] | Credit contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 4,281 [2] 4,398 [2]
Level 2 [Member] | Derivatives [Member] | Derivatives netting [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [2] 0 [2]
Level 2 [Member] | Long-term Debt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 6,959 [3] 6,686 [3]
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 21 25
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Precious metals [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 10,332 11,751
Level 2 [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 81 178
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Obligations of U.S. States and political subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 25 25
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Collateralized debt obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 158 159
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Student Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 68 68
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 107 495
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 7,233 6,223
Level 2 [Member] | Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 71,009 [2] 78,980 [2]
Level 2 [Member] | Derivatives [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 50,846 [2] 56,095 [2]
Level 2 [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 13,523 [2] 15,291 [2]
Level 2 [Member] | Derivatives [Member] | Equity contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1,983 [2] 2,042 [2]
Level 2 [Member] | Derivatives [Member] | Precious metals contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 784 [2] 1,400 [2]
Level 2 [Member] | Derivatives [Member] | Credit contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 3,873 [2] 4,152 [2]
Level 2 [Member] | Derivatives [Member] | Derivatives netting [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [2] 0 [2]
Level 2 [Member] | Securities available-for-sale [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 2 [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 8,478 9,439
Level 2 [Member] | Securities available-for-sale [Member] | Obligations of U.S. States and political subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 737 742
Level 2 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1 1
Level 2 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Commercial mortgages [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 96 126
Level 2 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Home Equity Line of Credit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 220 227
Level 2 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Others [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 94 94
Level 2 [Member] | Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 753 [4] 58 [4]
Level 2 [Member] | Mortgage servicing rights [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [5] 0 [5]
Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 4,082 3,667
Gross Balance, Liabilities 3,368 3,751
Level 3 [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Deposits in domestic offices
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 2,244 [1] 2,334 [1]
Level 3 [Member] | Trading Liabilities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 0
Level 3 [Member] | Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 392 [2] 517 [2]
Level 3 [Member] | Derivatives [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [2] 0 [2]
Level 3 [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 30 [2] 36 [2]
Level 3 [Member] | Derivatives [Member] | Equity contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 130 [2] 157 [2]
Level 3 [Member] | Derivatives [Member] | Precious metals contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [2] 3 [2]
Level 3 [Member] | Derivatives [Member] | Credit contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 232 [2] 321 [2]
Level 3 [Member] | Derivatives [Member] | Derivatives netting [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [2] 0 [2]
Level 3 [Member] | Long-term Debt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 732 [3] 900 [3]
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 2,808 2,260
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Precious metals [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Obligations of U.S. States and political subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Collateralized debt obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 258 254
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Student Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 117 121
Level 3 [Member] | Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 694 [2] 805 [2]
Level 3 [Member] | Derivatives [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1 [2] 1 [2]
Level 3 [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 126 [2] 131 [2]
Level 3 [Member] | Derivatives [Member] | Equity contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 154 [2] 160 [2]
Level 3 [Member] | Derivatives [Member] | Precious metals contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [2] 1 [2]
Level 3 [Member] | Derivatives [Member] | Credit contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 413 [2] 512 [2]
Level 3 [Member] | Derivatives [Member] | Derivatives netting [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [2] 0 [2]
Level 3 [Member] | Securities available-for-sale [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Obligations of U.S. States and political subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Commercial mortgages [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Home Equity Line of Credit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Others [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [4] 0 [4]
Level 3 [Member] | Mortgage servicing rights [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 205 [5] 227 [5]
Estimate of fair value [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 149,763 158,149
Netting, Assets (66,413) [6] (72,486) [6]
Net Balance, Assets 83,350 85,663
Gross Balance, Liabilities 90,447 97,540
Netting, Liabilities (65,111) [6] (70,732) [6]
Net Balance, Liabilities 25,336 26,808
Estimate of fair value [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 163 162
Net Balance, Assets 163 162
Estimate of fair value [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 874 881
Net Balance, Assets 874 881
Estimate of fair value [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 3,772 3,721
Net Balance, Assets 3,772 3,721
Estimate of fair value [Member] | Deposits in domestic offices
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 7,637 [1] 7,740 [1]
Net Balance, Liabilities 7,637 [1] 7,740 [1]
Estimate of fair value [Member] | Trading Liabilities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 4,360 4,134
Net Balance, Liabilities 4,360 4,134
Estimate of fair value [Member] | Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 70,759 [2] 78,080 [2]
Netting, Liabilities (65,111) [2],[6] (70,732) [2],[6]
Net Balance, Liabilities 5,648 [2] 7,348 [2]
Estimate of fair value [Member] | Derivatives [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 51,381 [2] 56,316 [2]
Netting, Liabilities 0 [2],[6] 0 [2],[6]
Net Balance, Liabilities 51,381 [2] 56,316 [2]
Estimate of fair value [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 12,582 [2] 14,628 [2]
Netting, Liabilities 0 [2],[6] 0 [2],[6]
Net Balance, Liabilities 12,582 [2] 14,628 [2]
Estimate of fair value [Member] | Derivatives [Member] | Equity contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 1,442 [2] 1,560 [2]
Netting, Liabilities 0 [2],[6] 0 [2],[6]
Net Balance, Liabilities 1,442 [2] 1,560 [2]
Estimate of fair value [Member] | Derivatives [Member] | Precious metals contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 841 [2] 857 [2]
Netting, Liabilities 0 [2],[6] 0 [2],[6]
Net Balance, Liabilities 841 [2] 857 [2]
Estimate of fair value [Member] | Derivatives [Member] | Credit contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 4,513 [2] 4,719 [2]
Netting, Liabilities 0 [2],[6] 0 [2],[6]
Net Balance, Liabilities 4,513 [2] 4,719 [2]
Estimate of fair value [Member] | Derivatives [Member] | Derivatives netting [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 0 [2] 0 [2]
Netting, Liabilities (65,111) [2],[6] (70,732) [2],[6]
Net Balance, Liabilities (65,111) [2] (70,732) [2]
Estimate of fair value [Member] | Long-term Debt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 7,691 [3] 7,586 [3]
Netting, Liabilities 0 [3],[6]  
Net Balance, Liabilities 7,691 [3] 7,586 [3]
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 2,808 2,260
Net Balance, Assets 2,808 2,260
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 21 25
Net Balance, Assets 21 25
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Precious metals [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 10,332 11,751
Net Balance, Assets 10,332 11,751
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 2,221 1,522
Net Balance, Assets 2,221 1,522
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Obligations of U.S. States and political subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 25 25
Net Balance, Assets 25 25
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Collateralized debt obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 258 254
Net Balance, Assets 258 254
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 158 159
Net Balance, Assets 158 159
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Student Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 68 68
Net Balance, Assets 68 68
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 107 495
Net Balance, Assets 107 495
Estimate of fair value [Member] | Trading securities, excluding derivatives [Member] | Debt Securities issued by foreign entities [Member] | Foreign Government Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 7,350 6,344
Net Balance, Assets 7,350 6,344
Estimate of fair value [Member] | Derivatives [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 71,869 [2] 80,055 [2]
Netting, Assets (66,413) [2],[6] (72,486) [2],[6]
Net Balance, Assets 5,456 [2] 7,569 [2]
Estimate of fair value [Member] | Derivatives [Member] | Interest rate contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 50,935 [2] 56,177 [2]
Netting, Assets 0 [2],[6] 0 [2],[6]
Net Balance, Assets 50,935 [2] 56,177 [2]
Estimate of fair value [Member] | Derivatives [Member] | Foreign exchange contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 13,675 [2] 15,429 [2]
Netting, Assets 0 [2],[6] 0 [2],[6]
Net Balance, Assets 13,675 [2] 15,429 [2]
Estimate of fair value [Member] | Derivatives [Member] | Equity contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 2,137 [2] 2,202 [2]
Netting, Assets 0 [2],[6] 0 [2],[6]
Net Balance, Assets 2,137 [2] 2,202 [2]
Estimate of fair value [Member] | Derivatives [Member] | Precious metals contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 836 [2] 1,583 [2]
Netting, Assets 0 [2],[6] 0 [2],[6]
Net Balance, Assets 836 [2] 1,583 [2]
Estimate of fair value [Member] | Derivatives [Member] | Credit contracts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 4,286 [2] 4,664 [2]
Netting, Assets 0 [2],[6] 0 [2],[6]
Net Balance, Assets 4,286 [2] 4,664 [2]
Estimate of fair value [Member] | Derivatives [Member] | Derivatives netting [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 [2] 0 [2]
Netting, Assets (66,413) [2],[6] (72,486) [2],[6]
Net Balance, Assets (66,413) [2] (72,486) [2]
Estimate of fair value [Member] | Securities available-for-sale [Member] | Corporate Debt Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 0 0
Net Balance, Assets 0 0
Estimate of fair value [Member] | Securities available-for-sale [Member] | U.S. Treasury, U.S. Government agencies and sponsored enterprises [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 47,631 48,952
Net Balance, Assets 47,631 48,952
Estimate of fair value [Member] | Securities available-for-sale [Member] | Obligations of U.S. States and political subdivisions [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 737 742
Net Balance, Assets 737 742
Estimate of fair value [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1 1
Net Balance, Assets 1 1
Estimate of fair value [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Commercial mortgages [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 96 126
Net Balance, Assets 96 126
Estimate of fair value [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Home Equity Line of Credit [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 220 227
Net Balance, Assets 220 227
Estimate of fair value [Member] | Securities available-for-sale [Member] | Asset backed securities [Member] | Others [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 94 94
Net Balance, Assets 94 94
Estimate of fair value [Member] | Loans [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 753 [4] 58 [4]
Net Balance, Assets 753 [4] 58 [4]
Estimate of fair value [Member] | Mortgage servicing rights [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 205 [5] 227 [5]
Net Balance, Assets $ 205 [5] $ 227 [5]
[1] Represents structured deposits risk-managed on a fair value basis for which we have elected to apply the fair value option.
[2] Includes trading derivative assets of $3,988 million and $5,991 million and trading derivative liabilities of $4,989 million and $6,741 million as of March 31, 2014 and December 31, 2013, respectively, as well as derivatives held for hedging and commitments accounted for as derivatives.
[3] Includes structured notes and own debt issuances which we have elected to measure on a fair value basis.
[4] Includes certain commercial loans held for sale which we have elected to apply the fair value option. See Note 6, "Loans Held for Sale," for further information.
[5] See Note 7, "Intangible Assets," for additional information.
[6] Represents counterparty and cash collateral netting which allow the offsetting of amounts relating to certain contracts if certain conditions are met.