Earnings Per Share (EPS) And Dividends (Basic And Diluted Earnings Per Share Computation) (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Disclosure Earnings Per Share E P S And Dividends Basic And Diluted Earnings Per Share Computation [Abstract]
Net Income	$ 444	$ 390	$ 1,042	$ 1,043
Weighted Average Common Shares Outstanding, Basic	505,862	505,858	505,937	505,900
Effect of Stock Based Compensation Awards, Basic	0	0	0	0
Total Shares, Basic	505,862	505,858	505,937	505,900
Net Income, Basic	$ 0.88	$ 0.77	$ 2.06	$ 2.06
Weighted Average Common Shares Outstanding, Diluted	505,862	505,858	505,937	505,900
Effect of Stock Based Compensation Awards, Diluted	1,560	1,836	1,465	1,533
Total Shares, Diluted	507,422	507,694	507,402	507,433
Net Income, Diluted	$ 0.87	$ 0.77	$ 2.05	$ 2.06