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, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Continuing Operations	$ 211	$ 320	$ 704	$ 782
Discontinued Operations	0	3	0	67
Net Income	211	323	704	849
Weighted Average Common Shares Outstanding, Basic	505,903	505,988	505,956	505,984
Effect of Stock Based Compensation Awards, Basic	0	0	0	0
Total Shares, Basic	505,903	505,988	505,956	505,984
Continuing Operations, Basic	$ 0.42	$ 0.63	$ 1.39	$ 1.55
Discontinued Operations, Basic	$ 0.00	$ 0.00	$ 0.00	$ 0.13
Net Income, Basic	$ 0.42	$ 0.63	$ 1.39	$ 1.68
Continuing Operations	211	320	704	782
Discontinued Operations	0	3	0	67
Net Income	$ 211	$ 323	$ 704	$ 849
Weighted Average Common Shares Outstanding, Diluted	505,903	505,988	505,956	505,984
Effect of Stock Based Compensation Awards, Diluted	1,066	773	1,043	961
Total Shares, Diluted	506,969	506,761	506,999	506,945
Continuing Operations, Diluted	$ 0.42	$ 0.63	$ 1.39	$ 1.54
Discontinued Operations, Diluted	$ 0.00	$ 0.00	$ 0.00	$ 0.13
NET INCOME	$ 0.42	$ 0.63	$ 1.39	$ 1.67