Equity - Accumulated Other Comprehensive Income (Loss), Net of Tax (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Tax	$ 0	$ 0	$ 0
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Tax	0	0	0
Unrealized Gain (Loss) on Equity Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Tax	0	0	0
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Tax	0	0	0
Unrecognized Actuarial Gain (Loss) on Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), Tax	$ 2	$ 1	$ (2)