CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Millions, except Share data in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
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	625			593			32
Other comprehensive income, net of taxes	28				28
Cash dividends declared	(493)			(493)
Equity-based compensation transactions, including dividend equivalents, net of taxes	86		(19)	(1)		106
Equity-based compensation transactions, including dividend equivalents, net of taxes, shares						3,329
Distributions paid to noncontrolling interests	(31)						(31)
Other	7		4				3
Other, shares						6
Ending balance at Sep. 30, 2012	$ 6,612	$ 6	$ 4,546	$ 6,820	$ 200	$ (5,284)	$ 324
Ending balance, shares at Sep. 30, 2012		630,282				(166,415)