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Loans - Schedule of Additional Information on Nonaccrual Loans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Receivables [Abstract]        
Interest income that would have been recorded if the nonaccrual receivable had been current in accordance with contractual terms during the period $ 18 $ 19 $ 38 $ 40
Interest income that was recorded on nonaccrual loans and included in interest income during the period $ 2 $ 3 $ 13 $ 9