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Premises, Equipment and Leasehold Improvements (Minimum Annual Rentals) (Details) - Annual Lease Rentals
$ in Millions
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
Required minimum annual rentals due 2018 $ 382
Required minimum annual rentals due 2019 343
Required minimum annual rentals due 2020 302
Required minimum annual rentals due 2021 260
Required minimum annual rentals due 2022 217
Required minimum annual rentals due 2023 and thereafter $ 1,051