Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 262	$ 295
Mortgage servicing rights [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	207	237
Mortage Servicing Rights - Residential Real Estate [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	205	227
Mortgage Servicing Rights - Commercial Real Estate [Member]
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	2	10
Purchased credit card relationships
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	52	54
Favorable lease argeement
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 3	$ 4