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Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Netting, Assets [1],[2] $ (62,411) $ (55,510)
Netting Liabilities [1],[2] (62,411) (55,510)
Trading assets 19,586 17,085
Trading liabilities 7,537 7,455
Obligations of U.S. states and political subdivision [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Trading assets 0 559
Precious metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Trading assets 2,669 780
Trading liabilities 49 650
Other securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Trading assets 15 18
Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Trading liabilities 6,458 6,406
Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Trading assets 3,674 5,150
Estimate of fair value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 130,036 114,065
Netting, Assets [3] (67,884) (60,452)
Net Balance, Assets 62,152 53,613
Gross Balance, Liabilities 91,838 83,148
Netting Liabilities [3] (63,716) (57,040)
Net Balance, Liabilities 28,122 26,108
Estimate of fair value [Member] | Trading liabilities excluding derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities 1,079 1,049
Net Balance, Liabilities 1,079 1,049
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 70,613 64,033
Netting Liabilities [3],[4] (63,716) (57,040)
Net Balance, Liabilities [4] 6,897 6,993
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 49,004 35,461
Netting Liabilities [3],[4] 0 0
Net Balance, Liabilities [4] 49,004 35,461
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 17,704 22,436
Netting Liabilities [3],[4] 0 0
Net Balance, Liabilities [4] 17,704 22,436
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 1,707 1,762
Netting Liabilities [3],[4] 0 0
Net Balance, Liabilities [4] 1,707 1,762
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 674 591
Netting Liabilities [3],[4] 0 0
Net Balance, Liabilities [4] 674 591
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 1,524 3,783
Netting Liabilities [3],[4] 0 0
Net Balance, Liabilities [4] 1,524 3,783
Estimate of fair value [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 0 0
Netting Liabilities [3],[4] (63,716) (57,040)
Net Balance, Liabilities [4] (63,716) (57,040)
Estimate of fair value [Member] | Securities Purchased under Agreements to Resell [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 769  
Net Balance, Assets 769  
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 Basis [Line Items]    
Gross Balance, Assets 4,554 3,255
Net Balance, Assets 4,554 3,255
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Obligations of U.S. states and political subdivision [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   559
Net Balance, Assets   559
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 191 221
Net Balance, Assets 191 221
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 99 114
Net Balance, Assets 99 114
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Student Loan Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 84 89
Net Balance, Assets 84 89
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 2,884 2,870
Net Balance, Assets 2,884 2,870
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 5,416  
Net Balance, Assets 5,416  
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Corporate debt securities issued by foreign entities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   55
Net Balance, Assets   55
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Government debt securities issued by foreign entities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   3,974
Net Balance, Assets   3,974
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 15 18
Net Balance, Assets 15 18
Estimate of fair value [Member] | Trading Securities, excluding derivatives [Member] | Precious metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 2,669 780
Net Balance, Assets 2,669 780
Estimate of fair value [Member] | Derivative financial assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 71,811 66,066
Netting, Assets [3],[4] (67,884) (60,452)
Net Balance, Assets [4] 3,927 5,614
Estimate of fair value [Member] | Derivative financial assets [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 47,899 35,269
Netting, Assets [3],[4] 0 0
Net Balance, Assets [4] 47,899 35,269
Estimate of fair value [Member] | Derivative financial assets [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 19,473 24,177
Netting, Assets [3],[4] 0 0
Net Balance, Assets [4] 19,473 24,177
Estimate of fair value [Member] | Derivative financial assets [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 1,981 1,806
Netting, Assets [3],[4] 0 0
Net Balance, Assets [4] 1,981 1,806
Estimate of fair value [Member] | Derivative financial assets [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 778 929
Netting, Assets [3],[4] 0 0
Net Balance, Assets [4] 778 929
Estimate of fair value [Member] | Derivative financial assets [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 1,680 3,885
Netting, Assets [3],[4] 0 0
Net Balance, Assets [4] 1,680 3,885
Estimate of fair value [Member] | Derivative financial assets [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 0 0
Netting, Assets [3],[4] (67,884) (60,452)
Net Balance, Assets [4] (67,884) (60,452)
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 Basis [Line Items]    
Gross Balance, Assets 39,622 34,545
Net Balance, Assets 39,622 34,545
Estimate of fair value [Member] | Securities available-for-sale [Member] | Obligations of U.S. states and political subdivision [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   348
Net Balance, Assets   348
Estimate of fair value [Member] | Securities available-for-sale [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 457 546
Net Balance, Assets 457 546
Estimate of fair value [Member] | Securities available-for-sale [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 158 161
Net Balance, Assets 158 161
Estimate of fair value [Member] | Securities available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 4 9
Net Balance, Assets 4 9
Estimate of fair value [Member] | Securities available-for-sale [Member] | Home Equity Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 65 75
Net Balance, Assets 65 75
Estimate of fair value [Member] | Securities available-for-sale [Member] | Other securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 494 89
Net Balance, Assets 494 89
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 30,902 25,076
Gross Balance, Liabilities 1,117 445
Level 1 [Member] | Trading liabilities excluding derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities 1,030 363
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 87 82
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 60 28
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 6 15
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 0 0
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 21 39
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 0 0
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 0 0
Level 1 [Member] | Securities Purchased under Agreements to Resell [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 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 Basis [Line Items]    
Gross Balance, Assets 4,374 3,088
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Obligations of U.S. states and political subdivision [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Student Loan Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0  
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Corporate debt securities issued by foreign entities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Government debt securities issued by foreign entities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   0
Level 1 [Member] | Trading Securities, excluding derivatives [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring 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 Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Derivative financial assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 93 64
Level 1 [Member] | Derivative financial assets [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 55 26
Level 1 [Member] | Derivative financial assets [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 0 0
Level 1 [Member] | Derivative financial assets [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 0 0
Level 1 [Member] | Derivative financial assets [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 38 38
Level 1 [Member] | Derivative financial assets [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 0 0
Level 1 [Member] | Derivative financial assets [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 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 Basis [Line Items]    
Gross Balance, Assets 26,435 21,924
Level 1 [Member] | Securities available-for-sale [Member] | Obligations of U.S. states and political subdivision [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   0
Level 1 [Member] | Securities available-for-sale [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Securities available-for-sale [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Securities available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Securities available-for-sale [Member] | Home Equity Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 1 [Member] | Securities available-for-sale [Member] | Other securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 95,724 85,412
Gross Balance, Liabilities 88,682 79,841
Level 2 [Member] | Trading liabilities excluding derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities 49 686
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 70,404 63,702
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 48,942 35,432
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 17,684 22,405
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 1,614 1,560
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 653 552
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 1,511 3,753
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 0 0
Level 2 [Member] | Securities Purchased under Agreements to Resell [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 769  
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 Basis [Line Items]    
Gross Balance, Assets 180 167
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Obligations of U.S. states and political subdivision [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   559
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 99 114
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Student Loan Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 84 89
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 5,416  
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Corporate debt securities issued by foreign entities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   55
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Government debt securities issued by foreign entities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   3,974
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 15 18
Level 2 [Member] | Trading Securities, excluding derivatives [Member] | Precious metals [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 2,669 780
Level 2 [Member] | Derivative financial assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 71,383 65,656
Level 2 [Member] | Derivative financial assets [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 47,841 35,241
Level 2 [Member] | Derivative financial assets [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 19,459 24,161
Level 2 [Member] | Derivative financial assets [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 1,883 1,687
Level 2 [Member] | Derivative financial assets [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 740 891
Level 2 [Member] | Derivative financial assets [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 1,460 3,676
Level 2 [Member] | Derivative financial assets [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 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 Basis [Line Items]    
Gross Balance, Assets 13,187 12,621
Level 2 [Member] | Securities available-for-sale [Member] | Obligations of U.S. states and political subdivision [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   348
Level 2 [Member] | Securities available-for-sale [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 457 546
Level 2 [Member] | Securities available-for-sale [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 158 161
Level 2 [Member] | Securities available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 4 9
Level 2 [Member] | Securities available-for-sale [Member] | Home Equity Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 65 75
Level 2 [Member] | Securities available-for-sale [Member] | Other securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 494 89
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 3,410 3,577
Gross Balance, Liabilities 2,039 2,862
Level 3 [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 191 221
Level 3 [Member] | Corporate and other domestic debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 2,884 2,870
Level 3 [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 1 1
Level 3 [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 0 0
Level 3 [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 5 [5] (83)
Level 3 [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 207 179
Level 3 [Member] | Trading liabilities excluding derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities 0 0
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 122 249
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 2 1
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 14 16
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 93 202
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 0 0
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 13 30
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 0 0
Level 3 [Member] | Securities Purchased under Agreements to Resell [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 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 Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Obligations of U.S. states and political subdivision [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 191 221
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Student Loan Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 2,884 2,870
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0  
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Corporate debt securities issued by foreign entities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Government debt securities issued by foreign entities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   0
Level 3 [Member] | Trading Securities, excluding derivatives [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring 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 Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Derivative financial assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 335 346
Level 3 [Member] | Derivative financial assets [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 3 2
Level 3 [Member] | Derivative financial assets [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 14 16
Level 3 [Member] | Derivative financial assets [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 98 119
Level 3 [Member] | Derivative financial assets [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 0 0
Level 3 [Member] | Derivative financial assets [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 220 209
Level 3 [Member] | Derivative financial assets [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 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 Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Obligations of U.S. states and political subdivision [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   0
Level 3 [Member] | Securities available-for-sale [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Home Equity Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Level 3 [Member] | Securities available-for-sale [Member] | Other securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Loans Receivable [Member] | Estimate of fair value [Member] | Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [6] 649 151
Net Balance, Assets [6] 649 151
Loans Receivable [Member] | Level 1 [Member] | Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [6] 0 0
Loans Receivable [Member] | Level 2 [Member] | Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [6] 649 151
Loans Receivable [Member] | Level 3 [Member] | Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [6] 0 0
Domestic Deposits [Member] | Estimate of fair value [Member] | Domestic Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 7,472 6,919
Net Balance, Liabilities [7] 7,472 6,919
Domestic Deposits [Member] | Level 1 [Member] | Domestic Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 0 0
Domestic Deposits [Member] | Level 2 [Member] | Domestic Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 6,068 5,052
Domestic Deposits [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5],[8] 1,404 1,867
Domestic Deposits [Member] | Level 3 [Member] | Domestic Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 1,404 1,867
Long-term debt [Member] | Estimate of fair value [Member] | Short-term borrowings [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 2,675 1,976
Netting Liabilities [3],[7] 0 0
Net Balance, Liabilities [7] 2,675 1,976
Long-term debt [Member] | Estimate of fair value [Member] | Long-term Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 9,999 9,171
Netting Liabilities [3],[7] 0  
Net Balance, Liabilities [7] 9,999 9,171
Long-term debt [Member] | Level 1 [Member] | Short-term borrowings [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 0 0
Long-term debt [Member] | Level 1 [Member] | Long-term Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 0 0
Long-term debt [Member] | Level 2 [Member] | Short-term borrowings [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 2,675 1,976
Long-term debt [Member] | Level 2 [Member] | Long-term Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 9,486 8,425
Long-term debt [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5],[8] 513 746
Long-term debt [Member] | Level 3 [Member] | Short-term borrowings [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 0 0
Long-term debt [Member] | Level 3 [Member] | Long-term Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [7] 513 746
Mortgage servicing rights [Member] | Estimate of fair value [Member] | Mortgage servicing rights [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [9] 95 140
Net Balance, Assets [9] 95 140
Mortgage servicing rights [Member] | Level 1 [Member] | Mortgage servicing rights [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [9] 0 0
Mortgage servicing rights [Member] | Level 2 [Member] | Mortgage servicing rights [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [9] 95 0
Mortgage servicing rights [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   140
Mortgage servicing rights [Member] | Level 3 [Member] | Mortgage servicing rights [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [9] $ 0 $ 140
[1] Netting is performed at a counterparty level in cases where enforceable master netting agreements are in place, regardless of the type of derivative instrument. Therefore, we have not attempted to allocate netting to the different types of derivative instruments shown in the table above.
[2] Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable netting agreements.
[3] Represents counterparty and cash collateral netting which allow the offsetting of amounts relating to certain contracts if certain conditions are met.
[4] Includes trading derivative assets of $3,674 million and $5,150 million and trading derivative liabilities of $6,458 million and $6,406 million at September 30, 2016 and December 31, 2015, respectively, as well as derivatives held for hedging and commitments accounted for as derivatives.
[5] We are the client-facing entity and we enter into identical but opposite derivatives to transfer the resultant risks to our affiliates. With the exception of counterparty credit risks, we are market neutral. The corresponding intra-group derivatives are presented as equity derivatives and foreign exchange derivatives in the table.
[6] 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.
[7] See Note 11, "Fair Value Option," for additional information.
[8] Structured deposits and structured notes contain embedded derivative features whose fair value measurements contain significant Level 3 inputs.
[9] See Note 7, "Intangible Assets," and Note 9, "Other Assets Held for Sale," for additional information.