Consolidated Statements of Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Shares	Paid-in Capital in Excess of Par Value	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling interest in Consolidated Subsidiaries
Beginning balance at Dec. 31, 2010	$ (10,387)	$ (2,674)	$ (339)	$ (4,771)	$ (12,371)	$ 240	$ (14)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,844	0	0	0	2,839	0	5
Other Comprehensive Income (Loss), Net of Tax	(34)	0	0	0	0	(33)	(1)
Cash dividends	(330)	0	0	0	(330)	0	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(315)	(9)	(82)	(224)	0	0	0
Other	34	0	34	0	0	0	0
Ending balance at Dec. 31, 2011	(13,216)	(2,683)	(455)	(4,547)	(14,880)	273	(18)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,645	0	0	0	2,635	0	10
Other Comprehensive Income (Loss), Net of Tax	(36)	0	0	0	0	(36)	0
Cash dividends	(333)	0	0	0	(333)	0	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(295)	(1)	(25)	(271)	0	0	0
Other	3	0	6	0	0	0	(3)
Ending balance at Dec. 31, 2012	(15,790)	(2,682)	(486)	(4,276)	(17,182)	309	(25)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,135	0	0	0	2,125	0	10
Other Comprehensive Income (Loss), Net of Tax	2	0	0	0	0	2	0
Treasury Stock, Value, Acquired, Cost Method	(4,356)	0	0	(4,356)	0	0	0
Cash dividends	(465)	0	0	0	(465)	0	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(484)	(2)	(97)	(583)	0	0	0
Other	(25)	0	26	0	0	0	(1)
Ending balance at Dec. 31, 2013	$ (13,615)	$ (2,680)	$ (415)	$ (8,049)	$ (18,842)	$ 307	$ (34)