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
	Mar. 31, 2014	Mar. 31, 2013
Disclosure Earnings Per Share E P S And Dividends Basic And Diluted Earnings Per Share Computation [Abstract]
Net Income	$ 386	$ 320
Weighted Average Common Shares Outstanding, Basic	506,077	505,942
Effect of Stock Based Compensation Awards, Basic	0	0
Total Shares, Basic	506,077	505,942
Net Income, Basic	$ 0.76	$ 0.63
Weighted Average Common Shares Outstanding, Diluted	506,077	505,942
Effect of Stock Based Compensation Awards, Diluted	1,754	1,278
Total Shares, Diluted	507,831	507,220
Net Income, Diluted	$ 0.76	$ 0.63