Statement of Changes in Total Equity (USD $) In Millions, unless otherwise specified	Total	Shareholders' Equity [Member]	Common Stock [Member]	Additional Paid In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Total Equity, beginning of period at Dec. 31, 2010	$ 6,374	$ 6,356	$ 88	$ 2,534	$ (614)	$ 9,590	$ (5,242)	$ 18
Issuance of common stock	629	629	4	625
Effect of issuing stock for employee benefit plans	156	156		27		(52)	181
Effects of acquistion of noncontrolling interest	(17)	2		2				(19)
Other comprehensive income (loss)	(173)	(173)			(173)
Net income	1,261	1,260				1,260		1
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(225)	(225)					(225)
Total Equity, end of period at Dec. 31, 2011	7,994	7,994	92	3,188	(787)	10,787	(5,286)	0
Effect of issuing stock for employee benefit plans	255	255		107		(69)	217
Other comprehensive income (loss)	116	116			116
Net income	1,623	1,623				1,623
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(208)	(208)					(208)
Redeemable Noncontrolling Interest [Roll Forward]
Effects of acquisition of joint venture	111
Other comprehensive income (loss)	2
Net income	1
Ending Balance at Dec. 31, 2012	114
Total Equity, end of period at Dec. 31, 2012	9,769	9,769	92	3,295	(671)	12,330	(5,277)	0
Effect of issuing stock for employee benefit plans	185	185		61		(119)	243
Effects of acquisition of joint venture	14							14
Other comprehensive income (loss)	151	151			151
Net income	1,476	1,476				1,476
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(1,003)	(1,003)					(1,003)
Redeemable Noncontrolling Interest [Roll Forward]
Effects of acquisition of joint venture	6
Other comprehensive income (loss)	(19)
Net income	2
Distribution to noncontrolling interest	(7)
Ending Balance at Dec. 31, 2013	96
Total Equity, end of period at Dec. 31, 2013	$ 10,581	$ 10,567	$ 92	$ 3,356	$ (520)	$ 13,676	$ (6,037)	$ 14