Comprehensive Income And Capital Structure (Schedule Of Changes In Stockholders' Deficit And Equity) (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Capital Structure [Line Items]
Balances, December 31, 2011			$ (7,014)
Net income	455	146	1,579	800
Other comprehensive loss
Distributions			(1,274)
Share-based benefit plans			83
Adjustment to the acquired controlling interest in equity investment			30
Other			33
Balances, September 30, 2012	(6,563)		(6,563)
Common Stock [Member]
Capital Structure [Line Items]
Balances, December 31, 2011			437,478
Share-based benefit plans			3,905
Balances, September 30, 2012	441,383		441,383
Balances, December 31, 2011			4
Other comprehensive loss
Balances, September 30, 2012	4		4
Capital In Excess Of Par Value [Member]
Capital Structure [Line Items]
Balances, December 31, 2011			1,601
Other comprehensive loss
Share-based benefit plans			83
Other			(4)
Balances, September 30, 2012	1,680		1,680
Accumulated Other Comprehensive Loss [Member]
Capital Structure [Line Items]
Balances, December 31, 2011			(440)
Other comprehensive loss
Balances, September 30, 2012	(440)		(440)
Retained Deficit [Member]
Capital Structure [Line Items]
Balances, December 31, 2011			(9,423)
Net income			1,291
Other comprehensive loss
Distributions			(971)
Balances, September 30, 2012	(9,103)		(9,103)
Equity Attributable To Noncontrolling Interests [Member]
Capital Structure [Line Items]
Balances, December 31, 2011			1,244
Net income			288
Other comprehensive loss
Distributions			(303)
Adjustment to the acquired controlling interest in equity investment			30
Other			37
Balances, September 30, 2012	$ 1,296		$ 1,296