Activity in the ALLL by segment (Detail) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Balance at beginning of period	$ 2,854	$ 3,176	$ 2,974	$ 3,120
Provision for loan losses	395	702	846	1,579
Loan charge-offs	(563)	(768)	(1,178)	(1,630)
Loan recoveries	58	46	102	87
Balance at end of period	2,744	3,156	2,744	3,156
Commercial Portfolio Segment
Balance at beginning of period	1,255	1,399	1,303	1,353
Provision for loan losses	124	270	232	485
Loan charge-offs	(220)	(251)	(405)	(443)
Loan recoveries	41	29	70	52
Balance at end of period	1,200	1,447	1,200	1,447
Residential Mortgage Loans
Balance at beginning of period	1,440	1,590	1,498	1,592
Provision for loan losses	252	413	574	1,014
Loan charge-offs	(303)	(470)	(688)	(1,078)
Loan recoveries	6	5	11	10
Balance at end of period	1,395	1,538	1,395	1,538
Consumer Portfolio Segment
Balance at beginning of period	159	187	173	175
Provision for loan losses	19	19	40	80
Loan charge-offs	(40)	(47)	(85)	(109)
Loan recoveries	11	12	21	25
Balance at end of period	$ 149	$ 171	$ 149	$ 171