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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Disclosure Earnings Per Share E P S And Dividends Basic And Diluted Earnings Per Share Computation [Abstract]
Net Income	$ 212	$ 333	$ 598	$ 653
Weighted Average Common Shares Outstanding, Basic	505,875	505,900	505,976	505,921
Effect of Stock Based Compensation Awards, Basic	0	0	0	0
Total Shares, Basic	505,875	505,900	505,976	505,921
Net Income, Basic	$ 0.42	$ 0.66	$ 1.18	$ 1.29
Weighted Average Common Shares Outstanding, Diluted	505,875	505,900	505,976	505,921
Effect of Stock Based Compensation Awards, Diluted	2,181	1,481	1,973	1,380
Total Shares, Diluted	508,056	507,381	507,949	507,301
Net Income, Diluted	$ 0.42	$ 0.66	$ 1.18	$ 1.29