Derivative Positions (Detail) - USD ($) $ in Millions		Dec. 31, 2016		Dec. 31, 2015
Derivative Asset, Notional Amount		$ 133,395		$ 123,025
Derivative Asset, Fair Value, Gross Asset		4,514		4,465
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4,902		4,428
Derivative Liability, Notional Amount		153,160		123,514
Derivative Liability, Fair Value, Gross Liability		4,902		4,428
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		4,514		4,465
Derivative, Fair Value, Amount Offset Against Collateral, Net		3,239		2,916
Derivative Liability, Fair Value, Gross Asset		(3,239)		(2,916)
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(291)		(397)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		(1,265)		(1,048)
Derivative Assets	[1]	(984)		(1,152)
Derivative Liabilities	[2]	398		464
Credit Risk Contract [Member]
Derivative Asset, Notional Amount		5		6
Derivative Liability, Notional Amount		13		9
Credit Default Swap, Buying Protection [Member]
Credit Risk Derivatives, at Fair Value, Net		3		1
Not Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount		126,335	[3]	106,765
Derivative Asset, Fair Value, Gross Asset		4,478	[3]	4,321
Derivative Liability, Notional Amount		137,570	[3]	119,984
Derivative Liability, Fair Value, Gross Liability		4,556	[3]	4,417
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member]
Derivative Asset, Notional Amount		12,165	[3],[4]	7,782	[5],[6]
Derivative Asset, Fair Value, Gross Asset		413	[3],[4]	198	[5],[6]
Derivative Liability, Notional Amount		18,774	[3],[4]	16,882	[5],[6]
Derivative Liability, Fair Value, Gross Liability		335	[3],[4]	98	[5],[6]
Not Designated as Hedging Instrument [Member] | Loans Held For Sale [Member]
Derivative Asset, Notional Amount		11,774	[3],[7]	4,309	[6],[8]
Derivative Asset, Fair Value, Gross Asset		134	[3],[7]	10	[6],[8]
Derivative Liability, Notional Amount		8,306	[3],[7]	2,520	[6],[8]
Derivative Liability, Fair Value, Gross Liability		58	[3],[7]	5	[6],[8]
Not Designated as Hedging Instrument [Member] | Loans [Member]
Derivative Asset, Notional Amount		100	[3]	15	[6]
Derivative Asset, Fair Value, Gross Asset		2	[3]	0
Derivative Liability, Notional Amount		36	[3]	40	[6]
Derivative Liability, Fair Value, Gross Liability		1	[3]	1	[6]
Not Designated as Hedging Instrument [Member] | Loans [Member] | Credit Risk Contract [Member]
Derivative Asset, Notional Amount		15	[3]	0
Derivative Asset, Fair Value, Gross Asset		0	[3]	0
Derivative Liability, Notional Amount		620	[3]	175	[6]
Derivative Liability, Fair Value, Gross Liability		8	[3]	2	[6]
Not Designated as Hedging Instrument [Member] | Other Trading [Member] | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		70,599	[3],[9]	67,164	[6],[10]
Derivative Asset, Fair Value, Gross Asset		1,536	[3],[9]	1,983	[6],[10]
Derivative Liability, Notional Amount		67,477	[3],[9]	66,854	[6],[10]
Derivative Liability, Fair Value, Gross Liability		1,401	[3],[9]	1,796	[6],[10]
Not Designated as Hedging Instrument [Member] | Other Trading [Member] | Credit Risk Contract [Member]
Derivative Asset, Notional Amount		2,128	[3],[11]	2,232	[6],[12]
Derivative Asset, Fair Value, Gross Asset		34	[3],[11]	57	[6],[12]
Derivative Liability, Notional Amount		2,271	[3],[11]	2,385	[6],[12]
Derivative Liability, Fair Value, Gross Liability		33	[3],[11]	54	[6],[12]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract
Derivative Asset, Notional Amount		3,231	[3]	3,648	[6]
Derivative Asset, Fair Value, Gross Asset		161	[3]	127	[6]
Derivative Liability, Notional Amount		3,360	[3]	3,227	[6]
Derivative Liability, Fair Value, Gross Liability		148	[3]	122	[6]
Not Designated as Hedging Instrument [Member] | Equity Contract [Member]
Derivative Asset, Notional Amount		23,164	[3],[9]	19,138	[6],[10]
Derivative Asset, Fair Value, Gross Asset		2,095	[3],[9]	1,812	[6],[10]
Derivative Liability, Notional Amount		35,312	[3],[9]	27,154	[6],[10]
Derivative Liability, Fair Value, Gross Liability		2,477	[3],[9]	2,222	[6],[10]
Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivative Asset, Notional Amount		2,412	[3],[13]	2,024	[6],[14]
Derivative Asset, Fair Value, Gross Asset		28	[3],[13]	21	[6],[14]
Derivative Liability, Notional Amount		668	[3],[13]	299	[6],[14]
Derivative Liability, Fair Value, Gross Liability		22	[3],[13]	6	[6],[14]
Not Designated as Hedging Instrument [Member] | Commodity [Member]
Derivative Asset, Notional Amount		747	[3]	453	[6]
Derivative Asset, Fair Value, Gross Asset		75	[3]	113	[6]
Derivative Liability, Notional Amount		746	[3]	448	[6]
Derivative Liability, Fair Value, Gross Liability		73	[3]	111	[6]
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		6,400	[15]	14,500	[16]
Derivative Asset, Fair Value, Gross Asset		34	[15]	130	[16]
Derivative Liability, Notional Amount		11,050	[15]	2,900	[16]
Derivative Liability, Fair Value, Gross Liability		265	[15]	11	[16]
Fair Value Hedging [Member] | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		660	[17]	1,760	[18]
Derivative Asset, Fair Value, Gross Asset		2	[17]	14	[18]
Derivative Liability, Notional Amount		4,540	[17]	630	[18]
Derivative Liability, Fair Value, Gross Liability		81	[17]	0
Fair Value Hedging [Member] | Fixed Income Interest Rate [Member]
Derivative Asset, Notional Amount		600	[17]	1,700	[18]
Derivative Asset, Fair Value, Gross Asset		2	[17]	14	[18]
Derivative Liability, Notional Amount		4,510	[17]	600	[18]
Derivative Liability, Fair Value, Gross Liability		81	[17]	0
Fair Value Hedging [Member] | Brokered Time Deposits [Member]
Derivative Asset, Notional Amount		60	[17]	60	[18]
Derivative Asset, Fair Value, Gross Asset		0	[17]	0
Derivative Liability, Notional Amount		30	[17]	30	[18]
Derivative Liability, Fair Value, Gross Liability		0	[17]	0
Interest rate futures [Member] | Mortgage Servicing Rights [Member]
Derivative Liability, Notional Amount		6,700		9,100
Interest rate futures [Member] | Loans Held For Sale [Member]
Derivative Asset, Notional Amount		720		518
Interest rate futures [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		$ 12,300		$ 12,600

[1] At December 31, 2016, $984 million, net of $291 million offsetting cash collateral, is recognized in trading assets and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2015, $1.2 billion, net of $397 million offsetting cash collateral, is recognized in trading assets and derivative instruments within the Company's Consolidated Balance Sheets.

[2] At December 31, 2016, $398 million, net of $1.3 billion offsetting cash collateral, is recognized in trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. At December 31, 2015, $464 million, net of $1.0 billion offsetting cash collateral, is recognized in trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets.

[3] See “Economic Hedging and Trading Activities” in this Note for further discussion.

[4] Amount includes $6.7 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.

[5] Amount includes $9.1 billion of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.

[6] See “Economic Hedging and Trading Activities” in this Note for further discussion.

[7] Amount includes $720 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.

[8] Amount includes $518 million of notional amounts related to interest rate futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table.

[9] Amounts include $12.3 billion of notional amounts related to interest rate futures and $629 million of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt.

[10] Amounts include $12.6 billion of notional amounts related to interest rate futures and $329 million of notional amounts related to equity futures. These futures contracts settle in cash daily, one day in arrears. The derivative asset or liability associated with the one day lag is included in the fair value column of this table. Amounts also include notional amounts related to interest rate swaps hedging fixed rate debt.

[11] Asset and liability amounts include $5 million and $13 million, respectively, of notional amounts from purchased and written credit risk participation agreements, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor.

[12] Asset and liability amounts include $6 million and $9 million, respectively, of notional amounts from purchased and written credit risk participation agreements, whose notional is calculated as the notional of the derivative participated adjusted by the relevant RWA conversion factor.

[13] Includes $49 million notional amount that is based on the 3.2 million of Visa Class B shares, the conversion ratio from Class B shares to Class A shares, and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 16, “Guarantees” for additional information.

[14] Includes $49 million notional amount that is based on the 3.2 million of Visa Class B shares, the conversion ratio from Class B shares to Class A shares, and the Class A share price at the derivative inception date of May 28, 2009. This derivative was established upon the sale of Class B shares in the second quarter of 2009. See Note 16, “Guarantees” for additional information.

[15] See “Cash Flow Hedges” in this Note for further discussion.

[16] See “Cash Flow Hedges” in this Note for further discussion.

[17] See “Fair Value Hedges” in this Note for further discussion.

[18] See “Fair Value Hedges” in this Note for further discussion.