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Premises and Equipment - Schedule of Rent Expense and Future Minimum Lease Payments for Operating Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Rent expense applicable to operating leases $ 249 $ 250 $ 223
Rental income from owned properties and subleases 12 $ 8 $ 7
Future minimum lease payments for operating leases      
2018 255    
2019 228    
2020 199    
2021 173    
2022 147    
Thereafter $ 509