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Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets $ 192,229 $ 178,729
Netting, Assets (89,158) (84,996)
Net Balance, Assets 103,071 93,733
Gross Balance, Liabilities 124,940 117,170
Net Liabilities (85,543) (86,546)
Net Balance, Liabilities 39,397 30,624
Corporate and other domestic debt securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net Balance, Assets 1,618  
Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 175 140
Net Balance, Assets 175 140
Foreign debt securities [Member] | Large corporate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 839 1,235
Net Balance, Assets 839 1,235
Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 4,609 5,335
Net Balance, Assets 4,609 5,335
Trading securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 3,492 1,905
Net Balance, Assets 3,492 1,905
Trading securities, excluding derivatives [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 37 40
Net Balance, Assets 37 40
Trading securities, excluding derivatives [Member] | Precious metals trading [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 15,777 17,082
Net Balance, Assets 15,777 17,082
Trading securities, excluding derivatives [Member] | U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 2,806 297
Net Balance, Assets 2,806 297
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 678 755
Net Balance, Assets 678 755
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 309 274
Net Balance, Assets 309 274
Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Home Equity Mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets   1
Net Balance, Assets   1
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   2
Net Balance, Assets   2
Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Large corporate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 729 2,211
Net Balance, Assets 729 2,211
Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 5,415 7,461
Net Balance, Assets 5,415 7,461
Derivative Assets [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 99,857 94,822
Netting, Assets (89,158) (84,996)
Net Balance, Assets 10,699 9,826
Derivative Assets [Member] | Interest rate contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 75,071 61,709
Net Balance, Assets 75,071 61,709
Derivative Assets [Member] | Foreign exchange contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 14,180 15,665
Net Balance, Assets 14,180 15,665
Derivative Assets [Member] | Equity contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1,616 1,216
Net Balance, Assets 1,616 1,216
Derivative Assets [Member] | Precious metals contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 771 1,842
Net Balance, Assets 771 1,842
Derivative Assets [Member] | Credit contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 8,219 14,390
Net Balance, Assets 8,219 14,390
Derivative Assets [Member] | Derivatives netting [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Netting, Assets (89,158) (84,996)
Net Balance, Assets (89,158) (84,996)
Available-for-sale Securities [Member] | Corporate and other domestic debt securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 43 544
Net Balance, Assets 43 544
Available-for-sale Securities [Member] | U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 55,458 44,609
Net Balance, Assets 55,458 44,609
Available-for-sale Securities [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 2 5
Net Balance, Assets 2 5
Available-for-sale Securities [Member] | Asset backed securities [Member] | Commercial mortgage backed securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 264 451
Net Balance, Assets 264 451
Available-for-sale Securities [Member] | Asset backed securities [Member] | Home Equity Mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 242 270
Net Balance, Assets 242 270
Available-for-sale Securities [Member] | Asset backed securities [Member] | Student loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets   12
Net Balance, Assets   12
Available-for-sale Securities [Member] | Asset backed securities [Member] | Others [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 85 80
Net Balance, Assets 85 80
Available-for-sale Securities [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 815 600
Net Balance, Assets 815 600
Loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 424 378
Net Balance, Assets 424 378
Intangible Assets [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 173 220
Net Balance, Assets 173 220
Deposits in domestic offices
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 9,362 9,799
Net Balance, Liabilities 9,362 9,799
Trading liabilities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 7,214 7,342
Net Balance, Liabilities 7,214 7,342
Derivative [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 100,668 94,986
Net Liabilities (85,543) (86,546)
Net Balance, Liabilities 15,125 8,440
Derivative [Member] | Interest rate contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 75,385 62,768
Net Balance, Liabilities 75,385 62,768
Derivative [Member] | Foreign exchange contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 13,708 15,426
Net Balance, Liabilities 13,708 15,426
Derivative [Member] | Equity contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 1,174 1,251
Net Balance, Liabilities 1,174 1,251
Derivative [Member] | Precious metals contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 1,910 1,248
Net Balance, Liabilities 1,910 1,248
Derivative [Member] | Credit contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 8,491 14,293
Net Balance, Liabilities 8,491 14,293
Derivative [Member] | Derivatives netting [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net Liabilities (85,543) (86,546)
Net Balance, Liabilities (85,543) (86,546)
Long-term Debt [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 7,696 5,043
Net Balance, Liabilities 7,696 5,043
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 40,420 23,076
Gross Balance, Liabilities 599 432
Level 1 [Member] | Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 42 40
Level 1 [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 2,283 259
Level 1 [Member] | Derivative Assets [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 133 310
Level 1 [Member] | Derivative Assets [Member] | Interest rate contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 120 135
Level 1 [Member] | Derivative Assets [Member] | Foreign exchange contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 12 4
Level 1 [Member] | Derivative Assets [Member] | Precious metals contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1 171
Level 1 [Member] | Available-for-sale Securities [Member] | U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 37,962 22,467
Level 1 [Member] | Trading liabilities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 323 321
Level 1 [Member] | Derivative [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 276 111
Level 1 [Member] | Derivative [Member] | Interest rate contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 88 66
Level 1 [Member] | Derivative [Member] | Foreign exchange contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 5 13
Level 1 [Member] | Derivative [Member] | Precious metals contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 183 32
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 146,838 150,252
Gross Balance, Liabilities 119,724 112,541
Level 2 [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 175 140
Level 2 [Member] | Foreign debt securities [Member] | Large corporate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 839 1,235
Level 2 [Member] | Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 4,567 5,295
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1,874 226
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 25 27
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Precious metals trading [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 15,777 17,082
Level 2 [Member] | Trading securities, excluding derivatives [Member] | U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 523 38
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   52
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 309 274
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Asset backed securities [Member] | Home Equity Mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets   1
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   2
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Large corporate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 5 1,958
Level 2 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | US Government Agency Issued or Guaranteed [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 5,415 7,461
Level 2 [Member] | Derivative Assets [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 97,958 91,990
Level 2 [Member] | Derivative Assets [Member] | Interest rate contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 74,936 61,565
Level 2 [Member] | Derivative Assets [Member] | Foreign exchange contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 13,982 15,440
Level 2 [Member] | Derivative Assets [Member] | Equity contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1,396 1,047
Level 2 [Member] | Derivative Assets [Member] | Precious metals contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 759 1,641
Level 2 [Member] | Derivative Assets [Member] | Credit contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 6,885 12,297
Level 2 [Member] | Available-for-sale Securities [Member] | Corporate and other domestic debt securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 43 544
Level 2 [Member] | Available-for-sale Securities [Member] | U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 17,496 22,142
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Residential Mortgage [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 2 5
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Commercial mortgage backed securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 264 451
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Home Equity Mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 242 270
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Student loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets   12
Level 2 [Member] | Available-for-sale Securities [Member] | Asset backed securities [Member] | Others [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 85 80
Level 2 [Member] | Available-for-sale Securities [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 815 600
Level 2 [Member] | Loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 424 367
Level 2 [Member] | Deposits in domestic offices
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 6,482 6,932
Level 2 [Member] | Trading liabilities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 6,891 7,021
Level 2 [Member] | Derivative [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 98,976 93,631
Level 2 [Member] | Derivative [Member] | Interest rate contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 75,296 62,702
Level 2 [Member] | Derivative [Member] | Foreign exchange contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 13,520 15,191
Level 2 [Member] | Derivative [Member] | Equity contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 985 999
Level 2 [Member] | Derivative [Member] | Precious metals contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 1,717 1,186
Level 2 [Member] | Derivative [Member] | Credit contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 7,458 13,553
Level 2 [Member] | Long-term Debt [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 7,375 4,957
Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 4,971 5,401
Gross Balance, Liabilities 4,617 4,197
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1,618 1,679
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 12 13
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 678 703
Level 3 [Member] | Trading securities, excluding derivatives [Member] | Foreign debt securities [Member] | Large corporate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 724 253
Level 3 [Member] | Derivative Assets [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1,766 2,522
Level 3 [Member] | Derivative Assets [Member] | Interest rate contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 15 9
Level 3 [Member] | Derivative Assets [Member] | Foreign exchange contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 186 221
Level 3 [Member] | Derivative Assets [Member] | Equity contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 220 169
Level 3 [Member] | Derivative Assets [Member] | Precious metals contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 11 30
Level 3 [Member] | Derivative Assets [Member] | Credit contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 1,334 2,093
Level 3 [Member] | Loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets   11
Level 3 [Member] | Intangible Assets [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Assets 173 220
Level 3 [Member] | Deposits in domestic offices
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 2,880 2,867
Level 3 [Member] | Derivative [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 1,416 1,244
Level 3 [Member] | Derivative [Member] | Interest rate contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 1  
Level 3 [Member] | Derivative [Member] | Foreign exchange contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 183 222
Level 3 [Member] | Derivative [Member] | Equity contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 189 252
Level 3 [Member] | Derivative [Member] | Precious metals contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 10 30
Level 3 [Member] | Derivative [Member] | Credit contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities 1,033 740
Level 3 [Member] | Long-term Debt [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Gross Balance, Liabilities $ 321 $ 86