Capital Structure - Schedule of Changes in Stockholders' Deficit and Equity (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Capital Structure [Line Items]
Beginning Balances			$ (6,928)
Net income	632	537	1,086	975
Repurchase of common stock			(750)
Other comprehensive income	33	49	58	31
Distributions			(197)
Share-based benefit plans			146
Other			(3)
Ending Balances	(6,588)		(6,588)
Repurchase of common stock, Shares			14,554,628
Common Stock [Member]
Capital Structure [Line Items]
Beginning Balances			4
Net income			0
Repurchase of common stock			0
Other comprehensive income			0
Distributions			0
Share-based benefit plans			0
Other			0
Ending Balances	4		4
Beginning Balances, Shares			439,604
Repurchase of common stock, Shares			(14,555)
Share-based benefit plans, Shares			6,324
Ending Balances, Shares	431,373		431,373
Capital in Excess of Par Value [Member]
Capital Structure [Line Items]
Beginning Balances			1,386
Net income			0
Repurchase of common stock			(750)
Other comprehensive income			0
Distributions			0
Share-based benefit plans			146
Other			(5)
Ending Balances	777		777
Accumulated Other Comprehensive Loss [Member]
Capital Structure [Line Items]
Beginning Balances			(257)
Net income			0
Repurchase of common stock			0
Other comprehensive income			58
Distributions			0
Share-based benefit plans			0
Other			0
Ending Balances	(199)		(199)
Retained Deficit [Member]
Capital Structure [Line Items]
Beginning Balances			(9,403)
Net income			830
Repurchase of common stock			0
Other comprehensive income			0
Distributions			0
Share-based benefit plans			0
Other			1
Ending Balances	(8,572)		(8,572)
Equity Attributable to Noncontrolling Interests [Member]
Capital Structure [Line Items]
Beginning Balances			1,342
Net income			256
Repurchase of common stock			0
Other comprehensive income			0
Distributions			(197)
Share-based benefit plans			0
Other			1
Ending Balances	$ 1,402		$ 1,402