Noncash Investing and Financing Activities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Payments:
Interest	$ 406	$ 524	$ 658
Income taxes	535	383	102
Transfers:
Portfolio loans to loans held for sale	641	62	143
Loans held for sale to portfolio loans	44	77	32
Portfolio loans to OREO	204	272	342
Loans held for sale to OREO	$ 4	$ 23	$ 43