Discontinued Operations - Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Discontinued Operations Discontinued Operations Detail [Line Items]
Revenue		$ 102	$ 1,399	$ 2,961
Income (loss) before taxes		(63)	274	320
Tax expense		(6)	(37)	(53)
Net income attributable to noncontrolling interests			(5)	(6)
Gain on divestitures, net of tax	220		28	220
Income (loss) from discontinued operations		$ (69)	$ 260	$ 481