Bank Premises & Equipment (Bank Premises and Equipment) (Detail) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Bank Premises and Equipment
Land and improvements	[1]	$ 676	$ 685
Buildings		1,675	1,755
Equipment		1,724	1,696
Leasehold improvements		395	403
Construction in progress		106	85
Land and improvements held for sale		31	55
Buildings held for sale		20	20
Equipment held for sale		1	3
Leasehold improvements held for sale			3
Accumulated depreciation and amortization		(2,484)	(2,466)
Total bank premises and equipment	[2]	$ 2,144	$ 2,239

[1] (a ) At both June 30, 2016 and December 31, 2015 , land and improvements included $ 102 associated w ith parcels of undeveloped land intended for future branch expansion.

[2] Includes $ 52 and $ 81 of ban k premises and equipment held for sale at June 30, 2016 and December 31, 2015 , respectively. R efer to Note 7.