Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Recurring Basis) (Detail) (USD $) In Millions, unless otherwise specified											9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Residential mortgage loans	Sep. 30, 2013 Residential mortgage loans	Sep. 30, 2014 IRLCs, net	Sep. 30, 2013 IRLCs, net	Sep. 30, 2014 Stock warrants associated with Vantiv Holding, LLC	Sep. 30, 2013 Stock warrants associated with Vantiv Holding, LLC	Sep. 30, 2014 Swap associated with the sale of Visa, Inc. Class B shares	Sep. 30, 2013 Swap associated with the sale of Visa, Inc. Class B shares	Sep. 30, 2014 Minimum Residential mortgage loans	Sep. 30, 2013 Minimum Residential mortgage loans	Sep. 30, 2014 Minimum IRLCs, net	Sep. 30, 2013 Minimum IRLCs, net	Sep. 30, 2014 Minimum Stock warrants associated with Vantiv Holding, LLC		Sep. 30, 2013 Minimum Stock warrants associated with Vantiv Holding, LLC		Sep. 30, 2014 Minimum Swap associated with the sale of Visa, Inc. Class B shares	Sep. 30, 2013 Minimum Swap associated with the sale of Visa, Inc. Class B shares	Sep. 30, 2014 Maximum Residential mortgage loans	Sep. 30, 2013 Maximum Residential mortgage loans	Sep. 30, 2014 Maximum IRLCs, net	Sep. 30, 2013 Maximum IRLCs, net	Sep. 30, 2014 Maximum Stock warrants associated with Vantiv Holding, LLC		Sep. 30, 2013 Maximum Stock warrants associated with Vantiv Holding, LLC		Sep. 30, 2014 Maximum Swap associated with the sale of Visa, Inc. Class B shares	Sep. 30, 2013 Maximum Swap associated with the sale of Visa, Inc. Class B shares	Sep. 30, 2014 Weighted average Residential mortgage loans	Sep. 30, 2013 Weighted average Residential mortgage loans	Sep. 30, 2014 Weighted average IRLCs, net	Sep. 30, 2013 Weighted average IRLCs, net	Sep. 30, 2014 Weighted average Stock warrants associated with Vantiv Holding, LLC		Sep. 30, 2013 Weighted average Stock warrants associated with Vantiv Holding, LLC		Sep. 30, 2014 Weighted average Swap associated with the sale of Visa, Inc. Class B shares
Fair Value Inputs [Line Items]
Residential mortgage loans			$ 109	$ 89
Derivative instruments	1,532	1,553			10	24	358	293	(53)	(35)
Interest rate risk factor											(11.00%)	(19.90%)									18.50%	12.20%									4.50%	3.50%
Credit risk factor											0.00%	0.00%									58.60%	56.40%									1.70%	3.30%
Loan closing rates													4.00%	3.10%									95.00%	97.20%									65.00%	66.40%
Expected term (years)															2 years		2 years								14 years 9 months 18 days		15 years 9 months 6 days								6 years		5 years 1 month 6 days
Expected volatility															23.00%	[1]	21.00%	[1]							32.00%	[1]	33.40%	[1]							26.60%	[1]	27.80%	[1]
Timing of the resolution of the covered litigation																			2015-06-30	2014-03-31									2019-12-31	2017-03-31
Proportional share of covered litigation loss in excess of escrow funds																													$ 17										$ 17

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