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Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Netting, Assets [1],[2] $ (25,537) $ (29,510)
Netting Liabilities [1],[2] (25,537) (29,510)
Trading assets 27,284 28,452
Trading liabilities 5,397 3,235
Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Trading assets 6,043 5,693
Precious metals trading [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Trading assets 4,989 1,909
Trading liabilities 2,312 124
Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Trading liabilities 2,358 1,929
Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Trading assets 2,801 3,055
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 97,975 97,866
Netting, Assets [3] (29,616) (33,193)
Net Balance, Assets 68,359 64,673
Gross Balance, Liabilities 49,380 55,224
Netting Liabilities [3] (28,914) (33,900)
Net Balance, Liabilities 20,466 21,324
Fair Value, Recurring [Member] | Domestic Deposits [Member] | Domestic Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 4,155 7,209
Net Balance, Liabilities [4] 4,155 7,209
Fair Value, Recurring [Member] | Trading liabilities, excluding derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities 3,039 1,306
Net Balance, Liabilities 3,039 1,306
Fair Value, Recurring [Member] | Derivative financial liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 31,461 35,989
Netting Liabilities [3],[5] (28,914) (33,900)
Net Balance, Liabilities [5] 2,547 2,089
Fair Value, Recurring [Member] | Derivative financial liabilities [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 6,625 13,573
Netting Liabilities [3],[5] 0 0
Net Balance, Liabilities [5] 6,625 13,573
Fair Value, Recurring [Member] | Derivative financial liabilities [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 18,603 15,806
Netting Liabilities [3],[5] 0 0
Net Balance, Liabilities [5] 18,603 15,806
Fair Value, Recurring [Member] | Derivative financial liabilities [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 4,291 4,068
Netting Liabilities [3],[5] 0 0
Net Balance, Liabilities [5] 4,291 4,068
Fair Value, Recurring [Member] | Derivative financial liabilities [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 1,578 1,389
Netting Liabilities [3],[5] 0 0
Net Balance, Liabilities [5] 1,578 1,389
Fair Value, Recurring [Member] | Derivative financial liabilities [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 297 1,068
Netting Liabilities [3],[5] 0 0
Net Balance, Liabilities [5] 297 1,068
Fair Value, Recurring [Member] | Derivative financial liabilities [Member] | Other Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 67 [4] 85 [6]
Netting Liabilities [3],[5] 0 0 [6]
Net Balance, Liabilities [5] 67 [4] 85 [6]
Fair Value, Recurring [Member] | Derivative financial liabilities [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 0
Netting Liabilities [3],[5] (28,914) (33,900)
Net Balance, Liabilities [5] (28,914) (33,900)
Fair Value, Recurring [Member] | Short-term borrowings [Member] | Long-term debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4]   373
Net Balance, Liabilities [4]   373
Fair Value, Recurring [Member] | Long-term Debt [Member] | Long-term debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 10,725 10,347
Net Balance, Liabilities [4] 10,725 10,347
Fair Value, Recurring [Member] | Trading assets, 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 5,337 6,801
Net Balance, Assets 5,337 6,801
Fair Value, Recurring [Member] | Trading assets, excluding derivatives [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 63 71
Net Balance, Assets 63 71
Fair Value, Recurring [Member] | Trading assets, excluding derivatives [Member] | Residential mortgage asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 15 17
Net Balance, Assets 15 17
Fair Value, Recurring [Member] | Trading assets, excluding derivatives [Member] | Student loan asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 65 80
Net Balance, Assets 65 80
Fair Value, Recurring [Member] | Trading assets, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   510
Net Balance, Assets   510
Fair Value, Recurring [Member] | Trading assets, excluding derivatives [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 7,971 10,316
Net Balance, Assets 7,971 10,316
Fair Value, Recurring [Member] | Trading assets, excluding derivatives [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 6,043 5,693
Net Balance, Assets 6,043 5,693
Fair Value, Recurring [Member] | Trading assets, excluding derivatives [Member] | Precious metals trading [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 4,989 1,909
Net Balance, Assets 4,989 1,909
Fair Value, Recurring [Member] | Derivative financial assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 32,468 36,345
Netting, Assets [3],[5] (29,616) (33,193)
Net Balance, Assets [5] 2,852 3,152
Fair Value, Recurring [Member] | Derivative financial assets [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 6,687 12,395
Netting, Assets [3],[5] 0 0
Net Balance, Assets [5] 6,687 12,395
Fair Value, Recurring [Member] | Derivative financial assets [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 18,467 16,536
Netting, Assets [3],[5] 0 0
Net Balance, Assets [5] 18,467 16,536
Fair Value, Recurring [Member] | Derivative financial assets [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 5,616 5,107
Netting, Assets [3],[5] 0 0
Net Balance, Assets [5] 5,616 5,107
Fair Value, Recurring [Member] | Derivative financial assets [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 1,323 1,158
Netting, Assets [3],[5] 0 0
Net Balance, Assets [5] 1,323 1,158
Fair Value, Recurring [Member] | Derivative financial assets [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 367 1,139
Netting, Assets [3],[5] 0 0
Net Balance, Assets [5] 367 1,139
Fair Value, Recurring [Member] | Derivative financial assets [Member] | Other Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5],[6] 8 10
Netting, Assets [3],[5],[6] 0 0
Net Balance, Assets [5],[6] 8 10
Fair Value, Recurring [Member] | Derivative financial assets [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 0 0
Netting, Assets [3],[5] (29,616) (33,193)
Net Balance, Assets [5] (29,616) (33,193)
Fair Value, Recurring [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 [7] 35,408 32,234
Net Balance, Assets [7] 35,408 32,234
Fair Value, Recurring [Member] | Securities available-for-sale [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [7] 5,133 3,286
Net Balance, Assets [7] 5,133 3,286
Fair Value, Recurring [Member] | Securities available-for-sale [Member] | Home equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [7] 27 32
Net Balance, Assets [7] 27 32
Fair Value, Recurring [Member] | Securities available-for-sale [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [7] 104 111
Net Balance, Assets [7] 104 111
Fair Value, Recurring [Member] | Loans [Member] | Student Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 32  
Net Balance, Assets [4] 32  
Fair Value, Recurring [Member] | Loans [Member] | Loans Held For Sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 36 178
Net Balance, Assets [4] 36 178
Fair Value, Recurring [Member] | Other assets [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 149 147
Net Balance, Assets 149 147
Fair Value, Recurring [Member] | Other assets [Member] | Equity Securities Measured at Net Asset Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [8] 135 136
Net Balance, Assets [8] 135 136
Fair Value, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 43,978 43,501
Gross Balance, Liabilities 764 1,265
Fair Value, Recurring [Member] | Level 1 [Member] | Domestic Deposits [Member] | Domestic Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Trading liabilities, excluding derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities 727 1,182
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 37 83
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial liabilities [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 9 3
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial liabilities [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial liabilities [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial liabilities [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 28 80
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial liabilities [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial liabilities [Member] | Other Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 [4] 0 [6]
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial liabilities [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Short-term borrowings [Member] | Long-term debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4]   0
Fair Value, Recurring [Member] | Level 1 [Member] | Long-term Debt [Member] | Long-term debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Trading assets, 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 5,145 6,763
Fair Value, Recurring [Member] | Level 1 [Member] | Trading assets, excluding derivatives [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Trading assets, excluding derivatives [Member] | Residential mortgage asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Trading assets, excluding derivatives [Member] | Student loan asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Trading assets, 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
Fair Value, Recurring [Member] | Level 1 [Member] | Trading assets, excluding derivatives [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 7,953 10,095
Fair Value, Recurring [Member] | Level 1 [Member] | Trading assets, excluding derivatives [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 6,043 5,693
Fair Value, Recurring [Member] | Level 1 [Member] | Trading assets, excluding derivatives [Member] | Precious metals trading [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 15 260
Fair Value, Recurring [Member] | 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 [5] 15 110
Fair Value, Recurring [Member] | 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 [5] 0 80
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial assets [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 0 0
Fair Value, Recurring [Member] | 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 [5] 0 70
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial assets [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial assets [Member] | Other Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5],[6] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Derivative financial assets [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 0 0
Fair Value, Recurring [Member] | 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 [7] 22,880 17,532
Fair Value, Recurring [Member] | 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 [7] 1,942 3,158
Fair Value, Recurring [Member] | Level 1 [Member] | Securities available-for-sale [Member] | Home equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [7] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Securities available-for-sale [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [7] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Loans [Member] | Student Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 0  
Fair Value, Recurring [Member] | Level 1 [Member] | Loans [Member] | Loans Held For Sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Other assets [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 1 [Member] | Other assets [Member] | Equity Securities Measured at Net Asset Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [8] 0 0
Fair Value, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 53,024 53,304
Gross Balance, Liabilities 46,996 52,609
Fair Value, Recurring [Member] | Level 2 [Member] | Domestic Deposits [Member] | Domestic Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 3,509 6,435
Fair Value, Recurring [Member] | Level 2 [Member] | Trading liabilities, excluding derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities 2,312 124
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 30,898 35,684
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial liabilities [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 6,615 13,570
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial liabilities [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 18,597 15,805
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial liabilities [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 3,845 3,955
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial liabilities [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 1,550 1,306
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial liabilities [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 291 1,048
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial liabilities [Member] | Other Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 [4] 0 [6]
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial liabilities [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 0
Fair Value, Recurring [Member] | Level 2 [Member] | Short-term borrowings [Member] | Long-term debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4]   373
Fair Value, Recurring [Member] | Level 2 [Member] | Long-term Debt [Member] | Long-term debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 10,277 9,993
Fair Value, Recurring [Member] | Level 2 [Member] | Trading assets, 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 192 38
Fair Value, Recurring [Member] | Level 2 [Member] | Trading assets, excluding derivatives [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 63 71
Fair Value, Recurring [Member] | Level 2 [Member] | Trading assets, excluding derivatives [Member] | Residential mortgage asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 2 [Member] | Trading assets, excluding derivatives [Member] | Student loan asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 65 80
Fair Value, Recurring [Member] | Level 2 [Member] | Trading assets, 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
Fair Value, Recurring [Member] | Level 2 [Member] | Trading assets, excluding derivatives [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 18 221
Fair Value, Recurring [Member] | Level 2 [Member] | Trading assets, excluding derivatives [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 2 [Member] | Trading assets, excluding derivatives [Member] | Precious metals trading [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 4,989 1,909
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 31,761 35,798
Fair Value, Recurring [Member] | 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 [5] 6,637 12,275
Fair Value, Recurring [Member] | 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 [5] 18,452 16,456
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial assets [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 5,051 4,922
Fair Value, Recurring [Member] | 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 [5] 1,323 1,085
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial assets [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 298 1,060
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial assets [Member] | Other Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5],[6] 0 0
Fair Value, Recurring [Member] | Level 2 [Member] | Derivative financial assets [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 0 0
Fair Value, Recurring [Member] | 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 [7] 12,528 14,702
Fair Value, Recurring [Member] | 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 [7] 3,191 128
Fair Value, Recurring [Member] | Level 2 [Member] | Securities available-for-sale [Member] | Home equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [7] 0 32
Fair Value, Recurring [Member] | Level 2 [Member] | Securities available-for-sale [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [7] 0 0
Fair Value, Recurring [Member] | Level 2 [Member] | Loans [Member] | Student Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 32  
Fair Value, Recurring [Member] | Level 2 [Member] | Loans [Member] | Loans Held For Sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 36 178
Fair Value, Recurring [Member] | Level 2 [Member] | Other assets [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 149 147
Fair Value, Recurring [Member] | Level 2 [Member] | Other assets [Member] | Equity Securities Measured at Net Asset Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [8] 0 0
Fair Value, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 838 925
Gross Balance, Liabilities 1,620 1,350
Fair Value, Recurring [Member] | Level 3 [Member] | Domestic Deposits [Member] | Domestic Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 646 774
Fair Value, Recurring [Member] | Level 3 [Member] | Trading liabilities, excluding derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 526 222
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial liabilities [Member] | Interest rate contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 1 0
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial liabilities [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 6 1
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial liabilities [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 446 113
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial liabilities [Member] | Precious metals contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 3
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial liabilities [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 6 20
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial liabilities [Member] | Other Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 67 [4] 85 [6]
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial liabilities [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [5] 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Short-term borrowings [Member] | Long-term debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4]   0
Fair Value, Recurring [Member] | Level 3 [Member] | Long-term Debt [Member] | Long-term debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Liabilities [4] 448 354
Fair Value, Recurring [Member] | Level 3 [Member] | Trading assets, 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
Fair Value, Recurring [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member] | Residential mortgage asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 15 17
Fair Value, Recurring [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member] | Student loan asset-backed securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member] | Corporate and other domestic debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets   510
Fair Value, Recurring [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member] | Foreign debt securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Trading assets, excluding derivatives [Member] | Precious metals trading [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 692 287
Fair Value, Recurring [Member] | 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 [5] 35 10
Fair Value, Recurring [Member] | 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 [5] 15 0
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial assets [Member] | Equity contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 565 185
Fair Value, Recurring [Member] | 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 [5] 0 3
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial assets [Member] | Credit contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 69 79
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial assets [Member] | Other Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5],[6] 8 10
Fair Value, Recurring [Member] | Level 3 [Member] | Derivative financial assets [Member] | Derivatives netting [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [5] 0 0
Fair Value, Recurring [Member] | 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 [7] 0 0
Fair Value, Recurring [Member] | 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 [7] 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Securities available-for-sale [Member] | Home equity [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [7] 27 0
Fair Value, Recurring [Member] | Level 3 [Member] | Securities available-for-sale [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [7] 104 111
Fair Value, Recurring [Member] | Level 3 [Member] | Loans [Member] | Student Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 0  
Fair Value, Recurring [Member] | Level 3 [Member] | Loans [Member] | Loans Held For Sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [4] 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Other assets [Member] | Equity securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets 0 0
Fair Value, Recurring [Member] | Level 3 [Member] | Other assets [Member] | Equity Securities Measured at Net Asset Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Gross Balance, Assets [8] $ 0 $ 0
[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 allocated 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] See Note 16, "Fair Value Option," for additional information. Excluding the fair value movement on fair value option liabilities attributable to our own credit spread, which is recorded in other comprehensive income, fair value option assets and liabilities are recorded at fair value through net income (loss).
[5] Includes trading derivative assets of $2,801 million and $3,055 million and trading derivative liabilities of $2,358 million and $1,929 million at December 31, 2020 and 2019, respectively, as well as derivatives held for hedging and commitments accounted for as derivatives. See Note 15, "Derivative Financial Instruments," for additional information. Excluding changes in fair value of a derivative instrument associated with a qualifying cash flow hedge, which are recognized initially in other comprehensive income, derivative assets and liabilities are recorded at fair value through net income (loss).
[6] Consists of swap agreements entered into in conjunction with the sales of Visa Class B Shares.
[7] Securities available-for-sale are recorded at fair value through other comprehensive income. Changes in the allowance for credit losses on securities available-for-sale are recorded through net income (loss).
[8] Investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy.