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 (Accounting Standards Update 201026 [Member]) (Scenario, Previously Reported [Member])	$ 5,429	$ 5,417	$ 88	$ 2,514	$ (618)	$ 8,625	$ (5,192)	$ 12
Total Equity, beginning of period (Accounting Standards Update 201026 [Member]) (Restatement Adjustment [Member])	(219)	(219)			4	(223)
Total Equity, beginning of period at Dec. 31, 2009	5,210	5,198	88	2,514	(614)	8,402	(5,192)	12
Effect of issuing stock for employee benefit plans, Additional Paid In Capital				20
Effect of issuing stock for employee benefit plans, Retained Earnings						(80)	151
Effect of issuing stock for employee benefit plans, Total Equity	91	91
Other comprehensive income (loss) attributable to Parent	0	0			0
Other comprehensive income (loss) attributable to noncontrolling interest								2
Shareholders' net income	1,279	1,279				1,279
Shareholders' net income at Jan. 01, 2010 (Scenario, Previously Reported [Member])	1,345
Shareholders' net income (Restatement Adjustment [Member])	(66)
Net income attributable to noncontrolling interest	4
Net income attributable to noncontrolling interest at Jan. 01, 2010 (Scenario, Previously Reported [Member])	4
Net income attributable to noncontrolling interest (Restatement Adjustment [Member])	0
Net income	1,283
Net income at Jan. 01, 2010 (Scenario, Previously Reported [Member])	1,349
Net income (Restatement Adjustment [Member])	(66)
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(201)	(201)					(201)
Total Equity, end 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, Additional Paid In Capital				27
Effect of issuing stock for employee benefit plans, Retained Earnings						(52)	181
Effect of issuing stock for employee benefit plans, Total Equity	156	156
Effects of acquistion of noncontrolling interest	(17)	2		2				(19)
Other comprehensive income (loss) attributable to Parent	(173)	(173)			(173)
Shareholders' net income	1,260	1,260				1,260
Shareholders' net income at Jan. 01, 2011 (Scenario, Previously Reported [Member])	1,327
Shareholders' net income (Restatement Adjustment [Member])	(67)
Net income attributable to noncontrolling interest	1							1
Net income attributable to noncontrolling interest at Jan. 01, 2011 (Scenario, Previously Reported [Member])	1
Net income attributable to noncontrolling interest (Restatement Adjustment [Member])	0
Net income	1,261
Net income at Jan. 01, 2011 (Scenario, Previously Reported [Member])	1,328
Net income (Restatement Adjustment [Member])	(67)
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(225)	(225)					(225)
Redeemable Noncontrolling interest, Ending Balance at Dec. 31, 2011	0
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, Additional Paid In Capital				107
Effect of issuing stock for employee benefit plans, Retained Earnings						(69)	217
Effect of issuing stock for employee benefit plans, Total Equity	255	255
Effects of acquistion of noncontrolling interest	0	0		0
Other comprehensive income (loss) attributable to Parent	116	116			116
Shareholders' net income	1,623	1,623				1,623
Net income	1,624
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(208)	(208)					(208)
Increase (Decrease) in Temporary Equity [Roll Forward]
Effects of acquisition of joint venture	111
Reedemable Noncontrolling interest, Other comprehensive income	2
Reedeemable Noncontrolling Interest, Net income	1
Redeemable Noncontrolling interest, 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