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Bank Premises & Equipment - Bank Premises and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Bank Premises and Equipment    
Land and improvements $ 640 $ 586
Buildings 1,552 1,547
Equipment 2,095 1,987
Leasehold improvements 415 403
Construction in progress 98 81
Land and improvements held for sale 50 25
Branches held for sale 32 14
Equipment held for sale 5 3
Accumulated depreciation and amortization (2,834) (2,785)
Total bank premises and equipment $ 2,053 $ 1,861