Consolidated Statements of Shareholders' Equity (unaudited) (USD $) In Millions	Total	Common Stock	Additional Paid in Capital	Accumulated Other Comprehensive Loss	Treasury Stock at Cost	Retained Earnings
Balance at Beginning of Period at Dec. 31, 2010	$ 6,848	$ 651	$ 2,385	$ (104)	$ (624)	$ 4,540
Net Income	308	0	0	0	0	308
Stock-based Compensation	29	0	29	0	0	0
Exercise of Stock Options	26	2	24	0	0	0
Tax Benefits Related to Exercise of Stock Options	9	0	9	0	0	0
Dividends	(64)	0	0	0	0	(64)
Changes in Treasury Stock, Net	(16)	0	0	0	(16)	0
Unrealized Change in Fair Value	15	0	0	15	0	0
Net Change in Other	3	1	(1)	3	0	0
Balance at End of Period at Jun. 30, 2011	7,158	654	2,446	(86)	(640)	4,784
Balance at Beginning of Period at Dec. 31, 2011	7,265	656	2,497	(100)	(638)	4,850
Net Income	556	0	0	0	0	556
Stock-based Compensation	34	0	34	0	0	0
Exercise of Stock Options	26	0	26	0	0	0
Tax Benefits Related to Exercise of Stock Options	13	0	13	0	0	0
Dividends	(79)	0	0	0	0	(79)
Changes in Treasury Stock, Net	(13)	0	0	0	(13)	0
Change in Par Value	0	(654)	654		0	0
Net Change in Other	3	0	0	3	0	0
Balance at End of Period at Jun. 30, 2012	$ 7,805	$ 2	$ 3,224	$ (97)	$ (651)	$ 5,327