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	749	0	0	0	0	749
Stock-based Compensation	43	0	43	0	0	0
Exercise of Stock Options	32	2	30	0	0	0
Tax Benefits Related to Exercise of Stock Options	11	0	11	0	0	0
Dividends	(104)	0	0	0	0	(104)
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	4	2	(2)	4	0	0
Balance at End of Period at Sep. 30, 2011	7,582	655	2,467	(85)	(640)	5,185
Balance at Beginning of Period at Dec. 31, 2011	7,265	656	2,497	(100)	(638)	4,850
Net Income	776	0	0	0	0	776
Stock-based Compensation	51	0	51	0	0	0
Exercise of Stock Options	28	0	28	0	0	0
Tax Benefits Related to Exercise of Stock Options	14	0	14	0	0	0
Dividends	(119)	0	0	0	0	(119)
Changes in Treasury Stock, Net	(13)	0	0	0	(13)	0
Change in Par Value	0	(654)	654		0	0
Net Change in Other	6	0	0	6	0	0
Balance at End of Period at Sep. 30, 2012	$ 8,008	$ 2	$ 3,244	$ (94)	$ (651)	$ 5,507