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				18
Effect of issuing stock for employee benefit plans, Retained Earnings						(47)
Effect of issuing stock for employee benefit plans, Treasury Stock							149
Total equity, Effects of stock issuance for employee benefit plans	120	120
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)	168	168			168
Shareholders' net income	804	804				804
Shareholders' net income (Scenario, Previously Reported [Member]) (Accounting Standards Update 201026 [Member])	837
Shareholders' net income (Restatement Adjustment [Member]) (Accounting Standards Update 201026 [Member])	(33)
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; $0.04)	(11)	(11)				(11)
Repurchase of common stock	(225)	(225)					(225)
Total Equity, end of period at Jun. 30, 2011	7,216	7,216	88	2,556	(446)	10,336	(5,318)	0
Total Equity, beginning of period at Mar. 31, 2011	6,715	6,715	88	2,547	(573)	9,965	(5,312)	0
Effect of issuing stock for employee benefit plans, Additional Paid In Capital				9
Effect of issuing stock for employee benefit plans, Retained Earnings						(20)
Effect of issuing stock for employee benefit plans, Treasury Stock							56
Total equity, Effects of stock issuance for employee benefit plans	45	45
Other comprehensive income (loss)	127	127			127
Shareholders' net income	391	391				391
Shareholders' net income (Scenario, Previously Reported [Member]) (Accounting Standards Update 201026 [Member])	408
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
Repurchase of common stock	(62)	(62)					(62)
Total Equity, end of period at Jun. 30, 2011	7,216	7,216	88	2,556	(446)	10,336	(5,318)	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				88
Effect of issuing stock for employee benefit plans, Retained Earnings						(26)
Effect of issuing stock for employee benefit plans, Treasury Stock							110
Total equity, Effects of stock issuance for employee benefit plans	172	172
Other comprehensive income (loss)	116	116			116
Shareholders' net income	751	751				751
Net income attributable to noncontrolling interest	0
Common dividends declared (per share: $0.04; $0.04)	(11)	(11)				(11)
Total Equity, end of period at Jun. 30, 2012	9,022	9,022	92	3,276	(671)	11,501	(5,176)	0
Total Equity, beginning of period at Mar. 31, 2012	8,561	8,561	92	3,268	(722)	11,123	(5,200)	0
Effect of issuing stock for employee benefit plans, Additional Paid In Capital				8
Effect of issuing stock for employee benefit plans, Retained Earnings						(2)
Effect of issuing stock for employee benefit plans, Treasury Stock							24
Total equity, Effects of stock issuance for employee benefit plans	30	30
Other comprehensive income (loss)	51	51			51
Shareholders' net income	380	380				380
Net income attributable to noncontrolling interest	0
Total Equity, end of period at Jun. 30, 2012	$ 9,022	$ 9,022	$ 92	$ 3,276	$ (671)	$ 11,501	$ (5,176)	$ 0