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]
Beginning Balance at Jun. 30, 2013	$ 101
Total Equity, beginning of period at Jun. 30, 2013	9,775	9,775	92	3,326	(1,014)	12,806	(5,435)
Increase (Decrease) In Stockholders' Equity [Roll Forward]
Effect of issuing stock for employee benefit plans	50	50		18		(32)	64
Other comprehensive income (loss)	55	55			55
Net income	553	553				553
Repurchase of common stock	(559)	(559)					(559)
Redeemable Noncontrolling Interest [Roll Forward]
Other comprehensive income (loss)	(6)
Net income	0
Distribution to noncontrolling interest	0
Ending Balance at Sep. 30, 2013	95
Total Equity, end of period at Sep. 30, 2013	9,874	9,874	92	3,344	(959)	13,327	(5,930)	0
Beginning Balance at Dec. 31, 2012	114
Total Equity, beginning of period at Dec. 31, 2012	9,769	9,769	92	3,295	(671)	12,330	(5,277)	0
Increase (Decrease) In Stockholders' Equity [Roll Forward]
Effect of issuing stock for employee benefit plans	152	152		49		(107)	210
Other comprehensive income (loss)	(288)	(288)			(288)
Net income	1,115	1,115				1,115
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(863)	(863)					(863)
Redeemable Noncontrolling Interest [Roll Forward]
Other comprehensive income (loss)	(15)
Net income	3
Distribution to noncontrolling interest	(7)
Ending Balance at Sep. 30, 2013	95
Total Equity, end of period at Sep. 30, 2013	9,874	9,874	92	3,344	(959)	13,327	(5,930)	0
Beginning Balance at Dec. 31, 2013	96
Total Equity, beginning of period at Dec. 31, 2013	10,581	10,567	92	3,356	(520)	13,676	(6,037)	14
Increase (Decrease) In Stockholders' Equity [Roll Forward]
Effect of issuing stock for employee benefit plans	125	125		57		(104)	172
Other comprehensive income (loss)	102	101			101			1
Net income	1,629	1,635				1,635		(6)
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(1,256)	(1,256)					(1,256)
Capital contribution by noncontrolling interest	5	(4)		(4)				9
Redeemable Noncontrolling Interest [Roll Forward]
Other comprehensive income (loss)	(6)
Net income	3
Capital contribution by noncontrolling interest	4
Distribution to noncontrolling interest	(4)
Ending Balance at Sep. 30, 2014	93
Total Equity, end of period at Sep. 30, 2014	11,175	11,157	92	3,409	(419)	15,196	(7,121)	18
Beginning Balance at Jun. 30, 2014	99
Total Equity, beginning of period at Jun. 30, 2014	10,952	10,937	92	3,405	(273)	14,677	(6,964)	15
Increase (Decrease) In Stockholders' Equity [Roll Forward]
Effect of issuing stock for employee benefit plans	35	35		8		(15)	42
Other comprehensive income (loss)	(146)	(146)			(146)
Net income	533	534				534		(1)
Repurchase of common stock	(199)	(199)					(199)
Capital contribution by noncontrolling interest	0	(4)		(4)				4
Redeemable Noncontrolling Interest [Roll Forward]
Other comprehensive income (loss)	(6)
Net income	(2)
Capital contribution by noncontrolling interest	2
Distribution to noncontrolling interest	0
Ending Balance at Sep. 30, 2014	93
Total Equity, end of period at Sep. 30, 2014	$ 11,175	$ 11,157	$ 92	$ 3,409	$ (419)	$ 15,196	$ (7,121)	$ 18