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Derivative Financial Instruments - Fair Value of Derivatives and Balance Offsetting (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Sep. 30, 2018
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 45,297 $ 31,279
Derivative Liabilities 43,413 30,438
Netting assets [1],[2] 36,394 24,613
Netting liabilities [1],[2] 36,394 24,613
Less: Gross amounts of cash collateral received subject to enforceable master netting agreements(5)(6) [1],[3] 4,480 3,433
Less: Gross amounts of cash collateral posted subject to enforceable master netting agreements(5)(6) [1],[3] 3,823 3,517
Derivative Asset 4,423 3,233
Derivative Liability 3,196 2,308
Less: Gross amounts of financial instrument collateral received not offset 742 722
Less: Gross amounts of financial instrument collateral posted not offset 370 462
Net amount of derivative asset 3,681 2,511
Net amount of derivative liability 2,826 1,846
Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Less: Gross amounts of cash collateral received subject to enforceable master netting agreements(5)(6) 3,423 2,563
Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Less: Gross amounts of cash collateral posted subject to enforceable master netting agreements(5)(6) 3,680 3,405
Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4] 98 41
Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4] 632 80
Interest rate contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5] 23,460 9,650
Interest rate contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5] 23,582 10,260
Interest rate contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4] 689 111
Interest rate contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4] 224 308
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5] 15,750 15,433
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5] 14,666 14,590
Precious metals contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5] 554 838
Precious metals contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5] 721 851
Credit contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5] 656 939
Credit contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5] 560 905
Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4] 84 0
Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4] 524 73
Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4] 4 4
Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4] 108 7
OTC Cleared [Member]    
Derivatives, Fair Value [Line Items]    
Increase (decrease) in derivative assets (11,500)  
Increase (decrease) in derivative liabilities (10,300)  
OTC Cleared [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 11,905 61
OTC Cleared [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 10,526 17
OTC Cleared [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 519 0
OTC Cleared [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 60 0
OTC Cleared [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 0 0
OTC Cleared [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 0 6
OTC Cleared [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 67 230
OTC Cleared [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 75 242
OTC Cleared [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 84 0
OTC Cleared [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 390 0
OTC Cleared [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 4 0
OTC Cleared [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 86 0
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 11,549 9,586
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 12,997 10,098
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 170 111
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 164 308
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 15,746 15,433
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 14,666 14,563
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 0 5
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 0 5
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 2,820 3,124
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 2,806 3,091
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 1,264 1,122
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 145 286
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 502 774
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 613 800
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 0 0
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 1 0
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 589 709
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 485 663
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 0 10
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 24 11
Bilateral OTC [Member] | Other Contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6],[7] 6 6
Bilateral OTC [Member] | Other Contracts [Member] | Not Designated as Hedging Instrument, Other [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6],[7] 52 51
Bilateral OTC [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 0 0
Bilateral OTC [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 134 73
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 0 4
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 22 7
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [4],[6] 10 37
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [4],[6] 0 0
Exchange Traded [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 6 3
Exchange Traded [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 59 145
Exchange Traded [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 4 0
Exchange Traded [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] 0 21
Exchange Traded [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets [5],[6] 52 64
Exchange Traded [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument, Trading [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities [5],[6] $ 108 $ 51
[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 the netting of cash collateral posted and received by counterparty under enforceable netting agreements.
[4] Derivative assets / liabilities related to cash flow hedges, fair value hedges and derivative instruments held for purposes other than for trading are recorded in other assets / interest, taxes and other liabilities on the consolidated balance sheet.
[5] Trading related derivative assets / liabilities are recorded in trading assets / trading liabilities on the consolidated balance sheet.
[6] Over-the-counter ("OTC") derivatives include derivatives executed and settled bilaterally with counterparties without the use of an organized exchange or central clearing house. The credit risk associated with bilateral OTC derivatives is managed through obtaining collateral and enforceable master netting agreements. OTC-cleared derivatives are executed bilaterally in the OTC market but then novated to a central clearing counterparty, whereby the central clearing counterparty becomes the counterparty to each of the original counterparties. Exchange traded derivatives are executed directly on an organized exchange. Credit risk is minimized for OTC-cleared derivatives and exchange traded derivatives through daily margining requirements. During the first quarter of 2018, a central clearing counterparty amended its rules for OTC-cleared interest rate derivatives to legally re-characterize daily variation margin payments to be settlement payments as opposed to cash collateral posted. The impact of reflecting the rule change for this central clearing counterparty as of December 31, 2017 would have been a reduction in gross derivative assets and liabilities of approximately $11.5 billion and $10.3 billion, respectively, with corresponding decreases in the related counterparty and cash collateral netting.
[7] Consists of swap agreements entered into in conjunction with the sales of Visa Inc. ("Visa") Class B common shares ("Class B Shares").