Accounting Policies Calculation of Diluted Shares (Detail) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Shares used in computation of basic earnings per share	463	457	461	456
Total dilutive effect of outstanding stock awards	0	0	0	8
Shares used in computation of diluted earnings per share	463	457	461	464