Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Recurring Basis) (Detail) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value Inputs [Line Items]
Derivative instruments		$ 2,111		$ 2,080
Residential mortgage loans
Fair Value Inputs [Line Items]
Residential mortgage loans measured at FV		178	$ 99
IRLCs, net
Fair Value Inputs [Line Items]
Derivative instruments		13	17
Stock warrants associated with Vantiv Holding, LLC
Fair Value Inputs [Line Items]
Derivative instruments		500	412
Swap associated with the sale of Visa, Inc. Class B shares
Fair Value Inputs [Line Items]
Derivative instruments		$ (55)	$ (54)
Minimum | Residential mortgage loans
Fair Value Inputs [Line Items]
Interest rate risk factor		(9.70%)	(16.60%)
Credit risk factor		0.00%	0.00%
Minimum | IRLCs, net
Fair Value Inputs [Line Items]
Loan closing rates		34.30%	16.50%
Minimum | Stock warrants associated with Vantiv Holding, LLC
Fair Value Inputs [Line Items]
Expected term (years)		2 years	2 years
Expected volatility	[1]	22.10%	23.80%
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		Sep. 30, 2016	Jun. 30, 2015
Proportional share of covered litigation loss in excess of escrow funds			$ 1
Maximum | Residential mortgage loans
Fair Value Inputs [Line Items]
Interest rate risk factor		20.00%	19.50%
Credit risk factor		85.50%	62.40%
Maximum | IRLCs, net
Fair Value Inputs [Line Items]
Loan closing rates		88.90%	95.00%
Maximum | Stock warrants associated with Vantiv Holding, LLC
Fair Value Inputs [Line Items]
Expected term (years)		14 years	15 years
Expected volatility	[1]	31.90%	32.30%
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		Mar. 31, 2021	Dec. 31, 2019
Proportional share of covered litigation loss in excess of escrow funds			$ 19
Weighted average | Residential mortgage loans
Fair Value Inputs [Line Items]
Interest rate risk factor		2.70%	4.60%
Credit risk factor		0.90%	2.10%
Weighted average | IRLCs, net
Fair Value Inputs [Line Items]
Loan closing rates		70.60%	62.70%
Weighted average | Stock warrants associated with Vantiv Holding, LLC
Fair Value Inputs [Line Items]
Expected term (years)		5 years 10 months 24 days	6 years
Expected volatility	[1]	25.90%	27.30%
Weighted average | Swap associated with the sale of Visa, Inc. Class B shares
Fair Value Inputs [Line Items]
Proportional share of covered litigation loss in excess of escrow funds			$ 18

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