Earnings Per Share (EPS) And Dividends (Basic And Diluted Earnings Per Share Computation) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net Income	$ 439	$ 444	$ 1,370	$ 1,042
Weighted Average Common Shares Outstanding, Basic (shares)	505	506	505	506
Effect of Stock Based Compensation Awards, Basic (shares)	0	0	0	0
Total Shares, Basic (shares)	505	506	505	506
Net Income, Basic (in dollars per share)	$ 0.87	$ 0.88	$ 2.71	$ 2.06
Weighted Average Common Shares Outstanding, Diluted (shares)	505	506	505	506
Effect of Stock Based Compensation Awards, Diluted (shares)	3	1	3	1
Total Shares, Diluted (shares)	508	507	508	507
Net Income, Diluted (in dollars per share)	$ 0.87	$ 0.87	$ 2.70	$ 2.05