Activity in the ALLL by segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 2,174	$ 2,457
Provision for loan losses	548	1,398	1,523
Loan charge-offs	(869)	(1,907)	(2,241)
Loan recoveries	191	226	201
Balance at end of period	2,044	2,174	2,457
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	902	964
Provision for loan losses	197	241
Loan charge-offs	(219)	(457)
Loan recoveries	66	154
Balance at end of period	946	902
Residential Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	1,131	1,354
Provision for loan losses	243	1,062
Loan charge-offs	(531)	(1,316)
Loan recoveries	87	31
Balance at end of period	930	1,131
Consumer Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	141	139
Provision for loan losses	108	95
Loan charge-offs	(119)	(134)
Loan recoveries	38	41
Balance at end of period	$ 168	$ 141