Bank Premises & Equipment (Bank Premises and Equipment) (Detail) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Bank Premises and Equipment
Land and improvements	[1]	$ 649	$ 663
Buildings	[1]	1,667	1,672
Equipment		1,773	1,761
Leasehold improvements		392	398
Construction in progress	[1]	109	99
Land and improvements held for sale		33	29
Buildings held for sale		16	9
Equipment held for sale		2	1
Accumulated depreciation and amortization		(2,589)	(2,567)
Total bank premises and equipment	[2]	$ 2,052	$ 2,065

[1] (a ) At both March 31, 2017 and December 31, 2016 , land and improvements , buildings and construction in progress i ncluded $ 92 associated w ith parcels of undeveloped land intended for future branch expansion.

[2] Includes $ 51 and $ 39 of bank premises and equipment held for sale at March 31, 2017 and December 31, 2016 , respectively. For further information refer to Note 7.