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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation Of Revenue [Line Items]        
Uncollected amounts receivable $ 53   $ 53  
Accrued interest and other liabilities [Member]        
Disaggregation Of Revenue [Line Items]        
Deferred revenue $ 46   $ 46  
Maximum [Member]        
Disaggregation Of Revenue [Line Items]        
Period of satisfaction of contract with customer 1 year   1 year  
ASU 2014-09 [Member]        
Disaggregation Of Revenue [Line Items]        
Expense recognized on credit card rewards in other costs of operations $ 3 $ 3 $ 6 $ 5