Bank Premises & Equipment (Bank Premises and Equipment) (Detail) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Bank Premises and Equipment
Land and improvements	[1]	$ 660	$ 586
Buildings	[1]	1,590	1,547
Equipment		2,053	1,987
Leasehold improvements		422	403
Construction in progress	[1]	98	81
Land and improvements held for sale		47	25
Branches held for sale		27	14
Equipment held for sale		4	3
Accumulated depreciation and amortization		(2,809)	(2,785)
Total bank premises and equipment	[2]	$ 2,092	$ 1,861

[1] At March 31, 2019 and December 31, 2018 , land and improvements , buildings and construction in progress included $ 57 and $ 55 , respectively, associated w ith parcels of undeveloped land intended for future branch expansion.

[2] Includes $ 78 and $ 42 of bank premises and equipment held for sale at March 31, 2019 and December 31, 2018 , respectively.