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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 36 $ 181
Purchased credit card relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets 36 41
Residential Mortgage [Member] | Mortgage servicing rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets $ 0 $ 140