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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation Of Revenue [Line Items]      
Uncollected amounts receivable $ 56    
Accrued interest and other liabilities [Member]      
Disaggregation Of Revenue [Line Items]      
Deferred revenue 43    
ASU 2014-09 [Member]      
Disaggregation Of Revenue [Line Items]      
Expense recognized on credit card rewards in other costs of operations $ 14 $ 13 $ 6