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Deposits and Borrowings - Schedule of Components of Interest Expense on Short-Term Borrowings and Long-Term Debt (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Short-term borrowings:        
Federal funds purchased and securities loaned or sold under agreements to repurchase $ 1 $ 1 $ 2 $ 2
Total short-term borrowings 1 1 2 2
Long-term debt:        
Securitized debt obligations 82 47 151 95
Senior and subordinated notes 179 111 328 217
Other long-term borrowings 11 27 35 50
Total long-term debt 272 185 514 362
Total interest expense $ 273 $ 186 $ 516 $ 364