Noncash Investing and Financing Activities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Transfers:
Portfolio loans to held for sale loans	$ 143	$ 650	$ 45
Held for sale loans to portfolio loans	32	160	47
Portfolio loans to OREO	342	662	377
Held for sale loans to OREO	43	68	36
Held for sale loans to trading securities			136
Impact of change in accounting principle:
Decrease in available-for-sale securities, net		941
Increase in portfolio loans		2,217
Decrease in demand deposits		18
Increase in other short-term borrowings		122
Increase in long-term debt		1,344
Cash Payments:
Interest	658	920	1,416
Income Taxes Paid	102	79	109
Acquisitions:
Fair value of tangible assets acquired			7
Goodwill and identifiable intangible assets acquired			13
Contingent consideration			$ (4)