Consolidated Statements of Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid in Capital	Accumulated Other Comprehensive Loss	Treasury Stock at Cost	Retained Earnings
Shareholders Equity, Beginning Balance at Dec. 31, 2011	$ 7,265	$ 1,312	$ 1,841	$ (100)	$ (638)	$ 4,850
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,027	0	0	0	0	1,027
Stock-based Compensation Expense	65	0	65	0	0	0
Exercise of Stock Options	56	4	52	0	0	0
Tax Benefits Related to Exercise of Stock Options	25	0	25	0	0	0
Cash Dividends	(164)	0	0	0	0	(164)
Purchase of Treasury Stock	(13)	0	0	0	(13)	0
Change in Par Value	0	(1,312)	1,312	0	0	0
Rabbi Trust Shares Sold	10	0	7	0	3	0
Net Change in Other	(13)	0	0	(13)	0	0
Shareholders Equity, Ending Balance at Dec. 31, 2012	8,258	4	3,302	(113)	(648)	5,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	978	0	0	0	0	978
Stock-based Compensation Expense	80	0	80	0	0	0
Exercise of Stock Options	51	0	51	0	0	0
Tax Benefits Related to Exercise of Stock Options	20	0	20	0	0	0
Cash Dividends	(198)	0	0	0	0	(198)
Purchase of Treasury Stock	(14)	0	0	0	(14)	0
Rabbi Trust Shares Sold	13	0	10	0	3	0
Net Change in Other	(4)	0	0	(4)	0	0
Shareholders Equity, Ending Balance at Dec. 31, 2013	9,184	4	3,463	(117)	(659)	6,493
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,214	0		0	0	1,214
Stock-based Compensation Expense	87	0	87	0	0	0
Exercise of Stock Options	48	0	48	0	0	0
Tax Benefits Related to Exercise of Stock Options	19	0	19	0	0	0
Cash Dividends	(249)	0	0	0	0	(249)
Purchase of Treasury Stock	(16)	0	0	0	(16)	0
Rabbi Trust Shares Sold	11	0	7	0	4	0
Net Change in Other	27	0	0	27	0	0
Shareholders Equity, Ending Balance at Dec. 31, 2014	$ 10,325	$ 4	$ 3,624	$ (90)	$ (671)	$ 7,458