CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) (USD $) In Millions, except Share data in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interests [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	860			817			43
Other comprehensive income (loss), net of taxes	21				21
Cash dividends declared	(658)			(658)
Equity-based compensation transactions, including dividend equivalents, net of taxes	101		(15)	(1)		117
Equity-based compensation transactions, including dividend equivalents, net of taxes, shares						3,680
Distributions paid to noncontrolling interests	(46)						(46)
Other	7		3				4
Other, shares						8
Ending balance at Dec. 31, 2012	6,675	6	4,549	6,879	193	(5,273)	321
Ending balance, shares at Dec. 31, 2012		630,282				(166,062)
Consolidated net income	130			98			32
Other comprehensive income (loss), net of taxes	(39)				(39)
Cash dividends declared	(683)			(683)
Equity-based compensation transactions, including dividend equivalents, net of taxes	216		47	(5)		174
Equity-based compensation transactions, including dividend equivalents, net of taxes, shares						5,461
Common stock repurchases	(239)					(239)
Common stock repurchases, shares						(5,368)
Distributions paid to noncontrolling interests	(59)						(59)
Other	1						1
Other, shares						7
Ending balance at Dec. 31, 2013	6,002	6	4,596	6,289	154	(5,338)	295
Ending balance, shares at Dec. 31, 2013		630,282				(165,962)
Consolidated net income	1,338			1,298			40
Other comprehensive income (loss), net of taxes	(131)				(131)
Cash dividends declared	(693)			(693)
Equity-based compensation transactions, including dividend equivalents, net of taxes	195		79	(6)		122
Equity-based compensation transactions, including dividend equivalents, net of taxes, shares						3,779
Common stock repurchases	(600)		(180)			(420)
Common stock repurchases, shares						(9,569)
Distributions paid to noncontrolling interests	(34)						(34)
Acquisitions of noncontrolling interests and divestiture of Wheelabrator business	(188)		90				(278)
Other, shares						7
Ending balance at Dec. 31, 2014	$ 5,889	$ 6	$ 4,585	$ 6,888	$ 23	$ (5,636)	$ 23
Ending balance, shares at Dec. 31, 2014		630,282				(171,745)