Condensed Consolidated Statement of Changes in Equity (Unaudited) (USD $) In Millions, except Share data in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interests
Beginning balance at Dec. 31, 2011	$ 6,390	$ 6	$ 4,561	$ 6,721	$ 172	$ (5,390)	$ 320
Beginning balance, shares at Dec. 31, 2011		630,282				(169,750)
Consolidated net income	402			379			23
Other comprehensive income, net of taxes	(9)				(9)
Cash dividends declared	(329)			(329)
Equity-based compensation transactions, including dividend equivalents, net of taxes	56		(22)			78
Equity-based compensation transactions, including dividend equivalents, net of taxes, shares						2,463
Distributions paid to noncontrolling interests	(23)						(23)
Other			1				(1)
Other, shares						3
Ending balance at Jun. 30, 2012	$ 6,487	$ 6	$ 4,540	$ 6,771	$ 163	$ (5,312)	$ 319
Ending balance, shares at Jun. 30, 2012		630,282				(167,284)