Consolidated Statements of Shareholders' Equity (unaudited) (USD $) In Millions	Total	Common Stock (1)		Additional Paid in Capital (1)		Accumulated Other Comprehensive Loss	Treasury Stock at Cost	Retained Earnings
Balance at Beginning of Period at Dec. 31, 2011	$ 7,265	$ 1,312	[1]	$ 1,841	[1]	$ (100)	$ (638)	$ 4,850
Net Income	556	0		0		0	0	556
Stock-based Compensation	34	0		34	[1]	0	0	0
Exercise of Stock Options	26	0		26	[1]	0	0	0
Tax Benefits Related to Exercise of Stock Options	13	0		13	[1]	0	0	0
Dividends	(79)	0		0		0	0	(79)
Changes in Treasury Stock, Net	(13)	0		0		0	(13)
Change in Par Value	0	(1,308)	[1]	1,308	[1]	0	0	0
Net Change in Pension and Other	3	0		0		3	0	0
Balance at End of Period at Jun. 30, 2012	7,805	4	[1]	3,222	[1]	(97)	(651)	5,327
Balance at Beginning of Period at Dec. 31, 2012	8,258	4	[1]	3,302	[1]	(113)	(648)	5,713
Net Income	639	0		0		0	0	639
Stock-based Compensation	38	0		38		0	0	0
Exercise of Stock Options	31	0		31		0	0	0
Tax Benefits Related to Exercise of Stock Options	12	0		12		0	0	0
Dividends	(96)	0		0		0	0	(96)
Changes in Treasury Stock, Net	(14)	0		0		0	(14)	0
Net Change in Pension and Other	7	0		0		7	0	0
Balance at End of Period at Jun. 30, 2013	$ 8,875	$ 4		$ 3,383		$ (106)	$ (662)	$ 6,256

[1] Amounts restated to reflect impact of stock split