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Bank Premises & Equipment - Bank Premises and Equipment (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Bank Premises and Equipment    
Land and improvements $ 660 $ 586
Buildings 1,595 1,547
Equipment 2,093 1,987
Leasehold improvements 426 403
Construction in progress 92 81
Land and improvements held for sale 40 25
Branches held for sale 26 14
Equipment held for sale 4 3
Accumulated depreciation and amortization (2,862) (2,785)
Total bank premises and equipment $ 2,074 $ 1,861