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]
Total Equity, beginning of period at Jun. 30, 2012		$ 9,022	$ 92	$ 3,276	$ (671)	$ 11,501	$ (5,176)
Effect of issuing stock for employee benefit plans, Additional Paid In Capital				6
Effect of issuing stock for employee benefit plans, Retained Earnings						(5)
Effect of issuing stock for employee benefit plans, Treasury Stock							8
Effect of issuing stock for employee benefit plans, Total Equity		9
Other comprehensive income (loss) attributable to Parent	118	118			118
Shareholders' net income	466	466				466
Net income	466
Repurchase of common stock		(85)					(85)
Total Equity, end of period at Sep. 30, 2012		9,530	92	3,282	(553)	11,962	(5,253)
Total Equity, beginning of period at Dec. 31, 2011		7,994	92	3,188	(787)	10,787	(5,286)
Effect of issuing stock for employee benefit plans, Additional Paid In Capital				94
Effect of issuing stock for employee benefit plans, Retained Earnings						(31)
Effect of issuing stock for employee benefit plans, Treasury Stock							118
Effect of issuing stock for employee benefit plans, Total Equity		181
Other comprehensive income (loss) attributable to Parent	234	234			234
Shareholders' net income	1,217
Net income	1,217	1,217				1,217
Common dividends declared (per share: $0.04)		(11)				(11)
Repurchase of common stock		(85)					(85)
Total Equity, end of period at Sep. 30, 2012		9,530	92	3,282	(553)	11,962	(5,253)
Redeemable Noncontrolling interest, Beginning Balance at Dec. 31, 2012	114
Total Equity, beginning of period at Dec. 31, 2012		9,769	92	3,295	(671)	12,330	(5,277)
Effect of issuing stock for employee benefit plans, Additional Paid In Capital				49
Effect of issuing stock for employee benefit plans, Retained Earnings						(107)
Effect of issuing stock for employee benefit plans, Treasury Stock							210
Effect of issuing stock for employee benefit plans, Total Equity		152
Other comprehensive income (loss) attributable to Parent	(288)	(288)			(288)
Shareholders' net income	1,115
Net income	1,118	1,115				1,115
Common dividends declared (per share: $0.04)		(11)				(11)
Repurchase of common stock		(863)					(863)
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable Noncontrolling interest, Other comprehensive income	(15)
Redeemable Noncontrolling Interest, Net income	3
Redeemable Noncontrolling Interest, Distribution to noncontrolling interest	(7)
Redeemable Noncontrolling interest, Ending Balance at Sep. 30, 2013	95
Total Equity, end of period at Sep. 30, 2013		9,874	92	3,344	(959)	13,327	(5,930)
Redeemable Noncontrolling interest, Beginning Balance at Jun. 30, 2013	101
Total Equity, beginning of period at Jun. 30, 2013		9,775	92	3,326	(1,014)	12,806	(5,435)
Effect of issuing stock for employee benefit plans, Additional Paid In Capital				18
Effect of issuing stock for employee benefit plans, Retained Earnings						(32)
Effect of issuing stock for employee benefit plans, Treasury Stock							64
Effect of issuing stock for employee benefit plans, Total Equity		50
Other comprehensive income (loss) attributable to Parent	55	55			55
Shareholders' net income	553	553				553
Net income	553
Repurchase of common stock		(559)					(559)
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable Noncontrolling interest, Other comprehensive income	(6)
Redeemable Noncontrolling Interest, Net income	0
Redeemable Noncontrolling interest, Ending Balance at Sep. 30, 2013	95
Total Equity, end of period at Sep. 30, 2013		$ 9,874	$ 92	$ 3,344	$ (959)	$ 13,327	$ (5,930)