Earnings Per Share (EPS) And Dividends (Basic And Diluted Earnings Per Share Computation) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Disclosure Earnings Per Share E P S And Dividends Basic And Diluted Earnings Per Share Computation [Abstract]
Net Income	$ 586	$ 386
Weighted Average Common Shares Outstanding, Basic	506	506
Effect of Stock Based Compensation Awards, Basic	0	0
Total Shares, Basic	506	506
Net Income, Basic	$ 1.16	$ 0.76
Weighted Average Common Shares Outstanding, Diluted	506	506
Effect of Stock Based Compensation Awards, Diluted	2	2
Total Shares, Diluted	508	508
Net Income, Diluted	$ 1.15	$ 0.76