Preferred and Common Stock - Schedule of Total Compensation Expense Recognized for All Stock Options and Awards (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Stock option grants	$ 21	$ 27	$ 34
Stock award grants	50	40	49
Total compensation expense before income taxes	71	67	83
Benefit for income taxes	23	21	27
Total compensation expense, net of income taxes	$ 48	$ 46	$ 56