Consolidated Statements of Shareholders' Equity (unaudited) (USD $) In Millions	Common Stock [Member]	Additional Paid in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock at Cost [Member]	Retained Earnings [Member]	Total
Balance at Beginning of Period at Dec. 31, 2010	$ 651	$ 2,385	$ (104)	$ (624)	$ 4,540	$ 6,848
Net Income	0	0	0	0	14	14
Stock-based Compensation	0	14	0	0	0	14
Exercise of Stock Options	2	21	0	0	0	23
Tax Benefits Related to Exercise of Stock Options	0	8	0	0	0	8
Restricted Stock Awards, Net	1	(1)	0	0	0	0
Dividends	0	0	0	0	(32)	(32)
Changes in Treasury Stock, Net	0	0	0	(16)	0	(16)
Unrealized Change in Fair Value	0	0	15	0	0	15
Net Change in Other	0	0	2	0	0	2
Balance at End of Period at Mar. 31, 2011	654	2,427	(87)	(640)	4,522	6,876
Balance at Beginning of Period at Dec. 31, 2011	656	2,497	(100)	(638)	4,850	7,265
Net Income	0	0	0	0	263	263
Stock-based Compensation	0	16	0	0	0	16
Exercise of Stock Options	2	25	0	0	0	27
Tax Benefits Related to Exercise of Stock Options	0	12	0	0	0	12
Restricted Stock Awards, Net	1	(1)	0	0	0	0
Dividends	0	0	0	0	(39)	(39)
Changes in Treasury Stock, Net	0	0	0	(13)	0	(13)
Net Change in Other	0	0	2	0	0	2
Balance at End of Period at Mar. 31, 2012	$ 659	$ 2,549	$ (98)	$ (651)	$ 5,074	$ 7,533