Fair Value Measurements (Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Recurring Basis)) (Detail) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Fair Value Inputs [Line Items]
Derivative instruments		$ 2,179		$ 1,852
Residential mortgage loans
Fair Value Inputs [Line Items]
Residential mortgage loans measured at FV		154	$ 178
IRLCs, net
Fair Value Inputs [Line Items]
Derivative instruments		34	13
Stock warrants associated with Vantiv Holding, LLC
Fair Value Inputs [Line Items]
Derivative instruments		327	500
Swap associated with the sale of Visa, Inc. Class B shares
Fair Value Inputs [Line Items]
Derivative instruments		$ (99)	$ (55)
Minimum | Residential mortgage loans
Fair Value Inputs [Line Items]
Interest rate risk factor		(5.20%)	(9.70%)
Minimum | IRLCs, net
Fair Value Inputs [Line Items]
Loan closing rates		5.30%	34.30%
Minimum | Stock warrants associated with Vantiv Holding, LLC
Fair Value Inputs [Line Items]
Expected term (years)		2 years	2 years
Expected volatility	[1]	21.60%	22.10%
Minimum | Swap associated with the sale of Visa, Inc. Class B shares
Fair Value Inputs [Line Items]
Timing of the resolution of the covered litigation		Dec. 31, 2018	Sep. 30, 2016
Maximum | Residential mortgage loans
Fair Value Inputs [Line Items]
Interest rate risk factor		16.30%	20.00%
Credit risk factor		80.50%	85.50%
Maximum | IRLCs, net
Fair Value Inputs [Line Items]
Loan closing rates		94.00%	88.90%
Maximum | Stock warrants associated with Vantiv Holding, LLC
Fair Value Inputs [Line Items]
Expected term (years)		13 years	14 years
Expected volatility	[1]	27.40%	31.90%
Maximum | Swap associated with the sale of Visa, Inc. Class B shares
Fair Value Inputs [Line Items]
Timing of the resolution of the covered litigation		Dec. 31, 2022	Mar. 31, 2021
Weighted average | Residential mortgage loans
Fair Value Inputs [Line Items]
Interest rate risk factor		5.00%	2.70%
Credit risk factor		1.10%	0.90%
Weighted average | IRLCs, net
Fair Value Inputs [Line Items]
Loan closing rates		75.50%	70.60%
Weighted average | Stock warrants associated with Vantiv Holding, LLC
Fair Value Inputs [Line Items]
Expected term (years)		5 years 9 months 18 days	5 years 10 months 24 days
Expected volatility	[1]	24.30%	25.90%

[1] (a) Based on historical and implied volatilities of Vantiv, Inc. and comparable companies assuming similar expected terms.