Derivative Positions (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017		Dec. 31, 2016
Document Period End Date		Mar. 31, 2017
Derivative Asset, Notional Amount		$ 119,513		$ 133,395
Derivative Asset, Fair Value, Gross Asset		3,887		4,514
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		4,487		4,902
Derivative Liability, Notional Amount		153,545		153,160
Derivative Liability, Fair Value, Gross Liability		4,487		4,902
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		3,887		4,514
Derivative, Fair Value, Amount Offset Against Collateral, Net		2,747		3,239
Derivative Liability, Fair Value, Gross Asset		(2,747)		(3,239)
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(277)		(291)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		(1,379)		(1,265)
Derivative Assets	[1]	(863)		(984)
Derivative Liabilities	[2]	361		398
Credit Risk Contract [Member]
Derivative Asset, Notional Amount		4		5
Derivative Liability, Notional Amount		12		13
Credit Default Swap, Buying Protection [Member]
Credit Risk Derivatives, at Fair Value, Net		1		3
Not Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount		113,383	[3]	126,335	[4]
Derivative Asset, Fair Value, Gross Asset		3,877	[3]	4,478	[4]
Derivative Liability, Notional Amount		139,225	[3]	137,570	[4]
Derivative Liability, Fair Value, Gross Liability		4,197	[3]	4,556	[4]
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member]
Derivative Asset, Notional Amount		9,608	[3],[5]	12,165	[4],[6]
Derivative Asset, Fair Value, Gross Asset		84	[3],[5]	413	[4],[6]
Derivative Liability, Notional Amount		20,242	[3],[5]	18,774	[4],[6]
Derivative Liability, Fair Value, Gross Liability		115	[3],[5]	335	[4],[6]
Not Designated as Hedging Instrument [Member] | Loans Held For Sale [Member]
Derivative Asset, Notional Amount		3,718	[3],[7]	11,774	[4],[8]
Derivative Asset, Fair Value, Gross Asset		16	[3],[7]	134	[4],[8]
Derivative Liability, Notional Amount		6,649	[3],[7]	8,306	[4],[8]
Derivative Liability, Fair Value, Gross Liability		25	[3],[7]	58	[4],[8]
Not Designated as Hedging Instrument [Member] | Loans [Member]
Derivative Asset, Notional Amount		110	[3]	100	[4]
Derivative Asset, Fair Value, Gross Asset		2	[3]	2	[4]
Derivative Liability, Notional Amount		51	[3]	36	[4]
Derivative Liability, Fair Value, Gross Liability		1	[3]	1	[4]
Not Designated as Hedging Instrument [Member] | Loans [Member] | Credit Risk Contract [Member]
Derivative Asset, Notional Amount		15	[3]	15	[4]
Derivative Asset, Fair Value, Gross Asset		0	[3]	0	[4]
Derivative Liability, Notional Amount		495	[3]	620	[4]
Derivative Liability, Fair Value, Gross Liability		6	[3]	8	[4]
Not Designated as Hedging Instrument [Member] | Other Trading [Member] | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		67,926	[3],[9]	70,599	[4],[10]
Derivative Asset, Fair Value, Gross Asset		1,253	[3],[9]	1,536	[4],[10]
Derivative Liability, Notional Amount		68,532	[3],[9]	67,477	[4],[10]
Derivative Liability, Fair Value, Gross Liability		1,165	[3],[9]	1,401	[4],[10]
Not Designated as Hedging Instrument [Member] | Other Trading [Member] | Credit Risk Contract [Member]
Derivative Asset, Notional Amount		2,107	[3],[11]	2,128	[4],[12]
Derivative Asset, Fair Value, Gross Asset		28	[3],[11]	34	[4],[12]
Derivative Liability, Notional Amount		2,125	[3],[11]	2,271	[4],[12]
Derivative Liability, Fair Value, Gross Liability		24	[3],[11]	33	[4],[12]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Asset, Notional Amount		3,598	[3]	3,231	[4]
Derivative Asset, Fair Value, Gross Asset		119	[3]	161	[4]
Derivative Liability, Notional Amount		3,632	[3]	3,360	[4]
Derivative Liability, Fair Value, Gross Liability		112	[3]	148	[4]
Not Designated as Hedging Instrument [Member] | Equity Contract [Member]
Derivative Asset, Notional Amount		22,852	[3],[9]	23,164	[4],[10]
Derivative Asset, Fair Value, Gross Asset		2,290	[3],[9]	2,095	[4],[10]
Derivative Liability, Notional Amount		36,432	[3],[9]	35,312	[4],[10]
Derivative Liability, Fair Value, Gross Liability		2,684	[3],[9]	2,477	[4],[10]
Not Designated as Hedging Instrument [Member] | Other Contract [Member]
Derivative Asset, Notional Amount		2,618	[3],[13]	2,412	[4],[14]
Derivative Asset, Fair Value, Gross Asset		32	[3],[13]	28	[4],[14]
Derivative Liability, Notional Amount		239	[3],[13]	668	[4],[14]
Derivative Liability, Fair Value, Gross Liability		15	[3],[13]	22	[4],[14]
Not Designated as Hedging Instrument [Member] | Commodity [Member]
Derivative Asset, Notional Amount		831	[3]	747	[4]
Derivative Asset, Fair Value, Gross Asset		53	[3]	75	[4]
Derivative Liability, Notional Amount		828	[3]	746	[4]
Derivative Liability, Fair Value, Gross Liability		50	[3]	73	[4]
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		4,850	[15]	6,400	[16]
Derivative Asset, Fair Value, Gross Asset		4	[15]	34	[16]
Derivative Liability, Notional Amount		10,600	[15]	11,050	[16]
Derivative Liability, Fair Value, Gross Liability		248	[15]	265	[16]
Fair Value Hedging [Member] | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		1,280	[17]	660	[18]
Derivative Asset, Fair Value, Gross Asset		6	[17]	2	[18]
Derivative Liability, Notional Amount		3,720	[17]	4,540	[18]
Derivative Liability, Fair Value, Gross Liability		42	[17]	81	[18]
Fair Value Hedging [Member] | Fixed Income Interest Rate [Member]
Derivative Asset, Notional Amount		1,250	[17]	600	[18]
Derivative Asset, Fair Value, Gross Asset		6	[17]	2	[18]
Derivative Liability, Notional Amount		3,660	[17]	4,510	[18]
Derivative Liability, Fair Value, Gross Liability		42	[17]	81	[18]
Fair Value Hedging [Member] | Brokered Time Deposits [Member]
Derivative Asset, Notional Amount		30	[17]	60	[18]
Derivative Asset, Fair Value, Gross Asset		0	[17]	0	[18]
Derivative Liability, Notional Amount		60	[17]	30	[18]
Derivative Liability, Fair Value, Gross Liability		0	[17]	0	[18]
Interest rate futures [Member] | Mortgage Servicing Rights [Member]
Derivative Liability, Notional Amount		7,900		6,700
Interest rate futures [Member] | Loans Held For Sale [Member]
Derivative Asset, Notional Amount		913		720
Interest rate futures [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		$ 11,600		$ 12,300

[1] At March 31, 2017, $863 million, net of $277 million offsetting cash collateral, is recognized in trading assets and derivative instruments within the Company's Consolidated Balance Sheets. 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.

[2] At March 31, 2017, $361 million, net of $1.4 billion offsetting cash collateral, is recognized in trading liabilities and derivative instruments within the Company's Consolidated Balance Sheets. 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.

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

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

[5] Amount includes $7.9 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] 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.

[7] Amount includes $913 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 $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.

[9] Amounts include $11.6 billion of notional amounts related to interest rate futures and $710 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 $12.3 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.

[11] Asset and liability amounts include $4 million and $12 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 $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.

[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 13, “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 13, “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.