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Loans - Outstanding Balance and Carrying Value of Acquired Loans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Outstanding balance $ 11,855 $ 16,506
Carrying value 10,767 15,074
Receivables Acquired with Deteriorated Credit Quality [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Financing Receivable, Allowance for Credit Losses 37 31
Provision for credit losses for Acquired Loans $ 6 $ 6