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 at Dec. 31, 2010 (Scenario, Previously Reported [Member])	$ 6,663	$ 6,645	$ 88	$ 2,534	$ (614)	$ 9,879	$ (5,242)	$ 18
Total Equity, beginning of period (Restatement Adjustment [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
Additional Paid In Capital, Effects of stock issuance for employee benefit plans				9
Retained Earnings, Effects of stock issuance for employee benefit plans						(27)
Other, primarily issuance of treasury stock for employee benefit plans							93
Total equity, Effects of stock issuance for employee benefit plans	75	75
Acquisition of noncontrolling interest								(19)
Effects of acquisition of noncontrolling interest		4		4
Total equity, Effect of acquiring noncontrolling interest	(15)
Other comprehensive income (loss)	41	41			41
Shareholders' net income	413	413				413
Shareholders' net income (Scenario, Previously Reported [Member]) (Accounting Standards Update 201026 [Member])	429
Shareholders' net income (Restatement Adjustment [Member]) (Accounting Standards Update 201026 [Member])	(16)
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	(163)	(163)					(163)
Accumulated Other Comprehensive Loss, Implementation effect of updated guidance on other than temporary impairments	0
Total Equity, end of period at Mar. 31, 2011	6,715	6,715	88	2,547	(573)	9,965	(5,312)	0
Total Equity, beginning of period at Dec. 31, 2011	7,994	7,994	92	3,188	(787)	10,787	(5,286)	0
Additional Paid In Capital, Effects of stock issuance for employee benefit plans				80
Retained Earnings, Effects of stock issuance for employee benefit plans						(24)
Other, primarily issuance of treasury stock for employee benefit plans							86
Total equity, Effects of stock issuance for employee benefit plans	142	142
Other comprehensive income (loss)	65	65			65
Shareholders' net income	371	371				371
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 Mar. 31, 2012	$ 8,561	$ 8,561	$ 92	$ 3,268	$ (722)	$ 11,123	$ (5,200)	$ 0