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, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Continuing Operations	$ 347	$ 265	$ 1,051	$ 1,047
Discontinued Operations	0	29	0	96
Net Income	$ 347	$ 294	$ 1,051	$ 1,143
Weighted Average Common Shares Outstanding, Basic	505,914	505,909	505,942	505,959
Effect of Stock Based Compensation Awards, Basic	0	0	0	0
Total Shares, Basic	505,914	505,909	505,942	505,959
Continuing Operations, Basic	$ 0.69	$ 0.52	$ 2.08	$ 2.07
Discontinued Operations, Basic	$ 0.00	$ 0.06	$ 0.00	$ 0.19
Net Income, Basic	$ 0.69	$ 0.58	$ 2.08	$ 2.26
Weighted Average Common Shares Outstanding, Diluted	505,914	505,909	505,942	505,959
Effect of Stock Based Compensation Awards, Diluted	1,197	1,090	1,095	1,004
Total Shares, Diluted	507,111	506,999	507,037	506,963
Continuing Operations, Diluted	$ 0.68	$ 0.52	$ 2.07	$ 2.06
Discontinued Operations, Diluted	$ 0.00	$ 0.06	$ 0.00	$ 0.19
Net Income, Diluted	$ 0.68	$ 0.58	$ 2.07	$ 2.25