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Loans - Schedule of Additional Information on Nonaccrual Loans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Receivables [Abstract]    
Interest income that would have been recorded if the nonaccrual receivable had been current in accordance with contractual terms during the period $ 14 $ 20
Interest income that was recorded on nonaccrual loans and included in interest income during the period $ 9 $ 11