Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Millions, except Share data	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Loss	Non-controlling Interest
Beginning Balance at Dec. 31, 2010	$ 6,767	$ 3,440	$ 3,431	$ (149)	$ 45
Beginning Balance, shares at Dec. 31, 2010	169,428,406	169,428,000
Net Income	563		561
Net Income (Loss) Attributable to Noncontrolling Interest	2				2
Dividends declared on common stock	(294)		(294)
Repurchase of common stock	(45)	(45)
Repurchase of common stock, shares		(928,000)
Benefit obligations, net of tax	5			5
Foreign currency translation, net of tax	(1)			(1)
Net change in unrealized losses on investments, net of tax	(1)			(1)
Stock-based compensation, distributions to noncontrolling interests and other	15	23
Payments of Dividends, Noncontrolling Interest					(8)
Stock-based compensation, distributions to noncontrolling interests and other, shares		751,000
Ending Balance at Sep. 30, 2011	$ 7,009	$ 3,418	$ 3,698	$ (146)	$ 39
Ending Balance, shares at Sep. 30, 2011	169,250,934	169,251,000