Stock Compensation Plans and Other Compensation Arrangements (Detail 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation by Share-based Payment Award
Stock-based compensation expense	$ 144	$ 183	$ 139
Tax benefits from stock-based compensation expense	41	45	55
Stock options
Share-based Compensation by Share-based Payment Award
Stock-based compensation expense	4	10	14
Stock awards
Share-based Compensation by Share-based Payment Award
Stock-based compensation expense	140	173	125
Stock options, exercised
Share-based Compensation by Share-based Payment Award
Tax benefits from stock-based compensation expense	25	26	18
Stock awards, issued
Share-based Compensation by Share-based Payment Award
Tax benefits from stock-based compensation expense	$ 16	$ 19	$ 37