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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Capital Structure [Line Items]
Beginning Balance			$ (8,341)
Net income	467	455	1,442	1,579
Other comprehensive income	52	9	83
Distributions			(308)
Share-based benefit plans			71
Other			9
Ending Balance	(7,044)		(7,044)
Common Stock [Member]
Capital Structure [Line Items]
Beginning Balance			4
Ending Balance	4		4
Beginning Balance, Shares			443,200
Share-based benefit plans, Shares			4,373
Ending Balance, Shares	447,573		447,573
Capital in Excess of Par Value [Member]
Capital Structure [Line Items]
Beginning Balance			1,753
Share-based benefit plans			71
Other			(3)
Ending Balance	1,821		1,821
Accumulated Other Comprehensive Loss [Member]
Capital Structure [Line Items]
Beginning Balance			(457)
Other comprehensive income			83
Ending Balance	(374)		(374)
Retained Deficit [Member]
Capital Structure [Line Items]
Beginning Balance			(10,960)
Net income			1,132
Other			1
Ending Balance	(9,827)		(9,827)
Equity Attributable to Noncontrolling Interests [Member]
Capital Structure [Line Items]
Beginning Balance			1,319
Net income			310
Distributions			(308)
Other			11
Ending Balance	$ 1,332		$ 1,332