Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	$ 220	$ 142
Other long-term liabilities	(908)	(912)
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	220	142
Marketable securities and other debt securities	114	111
Total long-term financial assets	334	253
Senior Notes	(2,187)	(2,185)
Commercial paper	(1,086)	(834)
Other long-term debt	(119)	(123)
Other long-term liabilities	(57)	(50)
Total long-term financial liabilities	(3,449)	(3,192)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	221	145
Marketable securities and other debt securities	114	111
Total long-term financial assets	335	256
Senior Notes	(2,319)	(2,302)
Commercial paper	(1,086)	(834)
Other long-term debt	(122)	(124)
Other long-term liabilities	(57)	(50)
Total long-term financial liabilities	$ (3,584)	$ (3,310)