Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 240	$ 295
Mortgage servicing rights [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	188	237
Mortage Servicing Rights - Residential Real Estate [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	186	227
Mortgage Servicing Rights - Commercial Real Estate [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	2	10
Purchased credit card relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	50	54
Favorable lease argeement [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 2	$ 4