Derivative Positions (Detail) - USD ($) $ in Millions		Dec. 31, 2015		Dec. 31, 2014
Derivative Asset, Notional Amount		$ 123,257		$ 118,139
Derivative Asset, Fair Value, Gross Asset		4,465		5,839
Derivative Liability, Notional Amount		124,755		114,144
Derivative Liability, Fair Value, Gross Liability		4,428		5,577
Derivative, Fair Value, Amount Offset Against Collateral, Net		(2,916)		(4,083)
Derivative Asset, Collateral, Obligation to Return Cash, Offset		(397)		(449)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		(1,048)		(1,032)
Derivative Assets	[1]	(1,152)		(1,307)
Derivative Liabilities	[2]	464		462
Other Trading [Member]
Derivative Assets		(1,152)		(1,307)
Derivative Liabilities		464		462
Credit Risk Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		6		4
Derivative Liability, Notional Amount		9	[3],[4]	4
Not Designated as Hedging Instrument [Member]
Derivative Asset, Notional Amount		107,027	[5]	97,259
Derivative Asset, Fair Value, Gross Asset		4,321	[5]	5,601
Derivative Liability, Notional Amount		121,255	[5]	108,694
Derivative Liability, Fair Value, Gross Liability		4,417	[5]	5,568
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Mortgage Servicing Rights [Member]
Derivative Asset, Notional Amount		7,782	[5]	5,172	[4]
Derivative Asset, Fair Value, Gross Asset		198	[5]	163	[4]
Derivative Liability, Notional Amount		16,882	[5]	8,807	[4]
Derivative Liability, Fair Value, Gross Liability		98	[5]	30	[4]
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Loans Held For Sale [Member]
Derivative Asset, Notional Amount		4,309	[5],[6]	1,840	[3],[4]
Derivative Asset, Fair Value, Gross Asset		10	[5],[6]	4	[3],[4]
Derivative Liability, Notional Amount		2,520	[5],[6]	4,923	[3],[4]
Derivative Liability, Fair Value, Gross Liability		5	[5],[6]	23	[3],[4]
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Loans [Member]
Derivative Asset, Notional Amount	[5]	15
Derivative Asset, Fair Value, Gross Asset		0
Derivative Liability, Notional Amount	[5]	40
Derivative Liability, Fair Value, Gross Liability	[5]	1
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		67,426	[5],[7]	61,049	[4],[8]
Derivative Asset, Fair Value, Gross Asset		1,983	[5],[7]	2,405	[4],[8]
Derivative Liability, Notional Amount		68,125	[5],[7]	61,065	[4],[8]
Derivative Liability, Fair Value, Gross Liability		1,796	[5],[7]	2,225	[4],[8]
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract | Other Trading [Member]
Derivative Asset, Notional Amount		3,648	[5]	2,429	[4]
Derivative Asset, Fair Value, Gross Asset		127	[5]	104	[4]
Derivative Liability, Notional Amount		3,227	[5]	2,414	[4]
Derivative Liability, Fair Value, Gross Liability		122	[5]	100	[4]
Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Loans [Member]
Derivative Asset, Notional Amount		0		0
Derivative Asset, Fair Value, Gross Asset		0		0
Derivative Liability, Notional Amount		175	[5]	392	[4]
Derivative Liability, Fair Value, Gross Liability		2	[5]	5	[4]
Not Designated as Hedging Instrument [Member] | Credit Risk Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		2,232	[5],[9]	2,282	[4],[10]
Derivative Asset, Fair Value, Gross Asset		57	[5],[9]	20	[4],[10]
Derivative Liability, Notional Amount		2,385	[5],[9]	2,452	[4],[10]
Derivative Liability, Fair Value, Gross Liability		54	[5],[9]	20	[4],[10]
Not Designated as Hedging Instrument [Member] | Equity Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		19,138	[5],[7]	21,875	[4],[8]
Derivative Asset, Fair Value, Gross Asset		1,812	[5],[7]	2,809	[4],[8]
Derivative Liability, Notional Amount		27,154	[5],[7]	28,128	[4],[8]
Derivative Liability, Fair Value, Gross Liability		2,222	[5],[7]	3,090	[4],[8]
Not Designated as Hedging Instrument [Member] | Other Contract [Member] | Loans [Member]
Derivative Asset, Notional Amount		2,024	[5],[11]	2,231	[4],[12]
Derivative Asset, Fair Value, Gross Asset		21	[5],[11]	25	[4],[12]
Derivative Liability, Notional Amount		299	[5],[11]	139	[4],[12]
Derivative Liability, Fair Value, Gross Liability		6	[5],[11]	5	[4],[12]
Not Designated as Hedging Instrument [Member] | Other Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		453	[5]	381	[4]
Derivative Asset, Fair Value, Gross Asset		113	[5]	71	[4]
Derivative Liability, Notional Amount		448	[5]	374	[4]
Derivative Liability, Fair Value, Gross Liability		111	[5]	70	[4]
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Adjustable Rate Loans [Member]
Derivative Asset, Notional Amount		14,500	[13]	18,150	[14]
Derivative Asset, Fair Value, Gross Asset		130	[13]	208	[14]
Derivative Liability, Notional Amount		2,900	[13]	2,850	[14]
Derivative Liability, Fair Value, Gross Liability		11	[13]	8	[14]
Fair Value Hedging | Interest Rate Contract [Member]
Derivative Asset, Notional Amount		1,730	[15]	2,730	[16]
Derivative Asset, Fair Value, Gross Asset		14	[15]	30	[16]
Derivative Liability, Notional Amount		600	[15]	2,600	[16]
Derivative Liability, Fair Value, Gross Liability		0		1	[16]
Fair Value Hedging | Interest Rate Contract [Member] | Fixed Income Interest Rate [Member]
Derivative Asset, Notional Amount		1,700	[15]	2,700	[16]
Derivative Asset, Fair Value, Gross Asset		14	[15]	30	[16]
Derivative Liability, Notional Amount		600	[15]	2,600	[16]
Derivative Liability, Fair Value, Gross Liability		0		1	[16]
Fair Value Hedging | Interest Rate Contract [Member] | Brokered Time Deposits [Member]
Derivative Asset, Notional Amount		30	[15]	30	[16]
Derivative Asset, Fair Value, Gross Asset		0		0
Derivative Liability, Notional Amount		0		0
Derivative Liability, Fair Value, Gross Liability		0		0
Interest rate futures [Member] | Interest Rate Contract [Member] | Loans [Member]
Derivative Asset, Notional Amount	[3],[4]	518
Derivative Liability, Notional Amount	[3],[4]			791
Interest rate futures [Member] | Interest Rate Contract [Member] | Other Trading [Member]
Derivative Asset, Notional Amount		$ 12,600		$ 10,300

[1] 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. At December 31, 2014, $1.3 billion, net of $449 million offsetting cash collateral, is recognized in trading assets and derivative instruments within the Company's Consolidated Balance Sheets.

[2] 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. At December 31, 2014, $462 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] Amount includes $791 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.

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

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

[6] 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.

[7] Amounts include $12.6 billion and $329 million of notional amounts related to interest rate futures and equity futures, respectively. 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.

[8] Amounts include $10.3 billion and $563 million of notional amounts related to interest rate futures and equity futures, respectively. 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.

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

[10] Asset and liability amounts both include $4 million of notional amounts from purchased and written interest rate swap risk participation agreements, respectively, whose notional is calculated as the notional of the interest rate swap participated adjusted by the relevant RWA conversion factor.

[11] Includes $49 million notional amount that is based on the number of Visa Class B shares, 3.2 million, 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.

[12] Includes $49 million notional amount that is based on the number of Visa Class B shares, 3.2 million, 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.

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

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

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

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