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Premises and Equipment (Summary of Leases) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Rent expense applicable to operating leases $ 278 $ 245 $ 227
Rental income from owned properties and subleases 8 $ 7 $ 7
Future minimum lease payments for operating leases      
2017 263    
2018 239    
2019 210    
2020 179    
2021 154    
Thereafter $ 574