Statement of Changes in Total Equity (Unaudited) (USD $) In Millions	Total	Shareholder Comprehensive Income Loss And Shareholders Equity [Member]	Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive Income	Retained Earnings	Treasury Stock	Noncontrolling Interest
Total Equity, beginning of period (Scenario, Previously Reported [Member]) (Accounting Standards Update 201026 [Member])	$ 6,663	$ 6,645	$ 88	$ 2,534	$ (614)	$ 9,879	$ (5,242)	$ 18
Total Equity, beginning of period (Restatement Adjustment [Member]) (Accounting Standards Update 201026 [Member])	(289)	(289)				(289)
Total Equity, beginning of period at Dec. 31, 2010	6,374	6,356	88	2,534	(614)	9,590	(5,242)	18
Effect of issuing stock for employee benefit plans, Additional Paid In Capital				23
Effect of issuing stock for employee benefit plans, Retained Earnings						(50)
Effect of issuing stock for employee benefit plans, Treasury Stock							165
Total equity, Effects of stock issuance for employee benefit plans	138	138
Effect of acquiring noncontrolling interest, Additional Paid-in Capital		4		4
Effect of acquiring noncontrolling interest, Noncontrolling interest								(19)
Total equity, Effect of acquiring noncontrolling interest	(15)
Other comprehensive income (loss)	181	181			181
Shareholders' net income	987	987				987
Shareholders' net income (Scenario, Previously Reported [Member]) (Accounting Standards Update 201026 [Member])	1,037
Shareholders' net income (Restatement Adjustment [Member]) (Accounting Standards Update 201026 [Member])	(50)
Net income attributable to noncontrolling interest	1							1
Net income attributable to noncontrolling interest (Scenario, Previously Reported [Member]) (Accounting Standards Update 201026 [Member])	1
Net income attributable to noncontrolling interest (Restatement Adjustment [Member]) (Accounting Standards Update 201026 [Member])	0
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(225)	(225)					(225)
Total Equity, end of period at Sep. 30, 2011	7,430	7,430	88	2,561	(433)	10,516	(5,302)	0
Total Equity, beginning of period at Jun. 30, 2011	7,216	7,216	88	2,556	(446)	10,336	(5,318)	0
Effect of issuing stock for employee benefit plans, Additional Paid In Capital				5
Effect of issuing stock for employee benefit plans, Retained Earnings						(3)
Effect of issuing stock for employee benefit plans, Treasury Stock							16
Total equity, Effects of stock issuance for employee benefit plans	18	18
Other comprehensive income (loss)	13	13			13
Shareholders' net income	183	183				183
Shareholders' net income (Scenario, Previously Reported [Member]) (Accounting Standards Update 201026 [Member])	200
Shareholders' net income (Restatement Adjustment [Member]) (Accounting Standards Update 201026 [Member])	(17)
Net income attributable to noncontrolling interest	0							0
Net income attributable to noncontrolling interest (Scenario, Previously Reported [Member]) (Accounting Standards Update 201026 [Member])	0
Net income attributable to noncontrolling interest (Restatement Adjustment [Member]) (Accounting Standards Update 201026 [Member])	0
Total Equity, end of period at Sep. 30, 2011	7,430	7,430	88	2,561	(433)	10,516	(5,302)	0
Total Equity, beginning 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				94
Effect of issuing stock for employee benefit plans, Retained Earnings						(31)
Effect of issuing stock for employee benefit plans, Treasury Stock							118
Total equity, Effects of stock issuance for employee benefit plans	181	181
Other comprehensive income (loss)	234	234			234
Shareholders' net income	1,217	1,217				1,217
Net income attributable to noncontrolling interest	0
Common dividends declared (per share: $0.04)	(11)	(11)				(11)
Repurchase of common stock	(85)	(85)					(85)
Total Equity, end of period at Sep. 30, 2012	9,530	9,530	92	3,282	(553)	11,962	(5,253)	0
Total Equity, beginning of period at Jun. 30, 2012	9,022	9,022	92	3,276	(671)	11,501	(5,176)	0
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
Total equity, Effects of stock issuance for employee benefit plans	9	9
Other comprehensive income (loss)	118	118			118
Shareholders' net income	466	466				466
Net income attributable to noncontrolling interest	0
Repurchase of common stock	(85)	(85)					(85)
Total Equity, end of period at Sep. 30, 2012	$ 9,530	$ 9,530	$ 92	$ 3,282	$ (553)	$ 11,962	$ (5,253)	$ 0