Carrying Values and Fair Values of Non-Current Financial Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	$ 215		$ 142
Other noncurrent liabilities	(891)	[1]	(912)	[1]
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	215		142
Marketable securities and other debt securities	44		111
Total noncurrent financial assets	259		253
Senior Notes	(2,272)		(2,185)
Commercial paper	(1,072)		(834)
Other long-term debt	(108)		(123)
Other noncurrent liabilities	(57)		(50)
Total noncurrent financial liabilities	(3,509)		(3,192)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior, mezzanine, and other loans	214		145
Marketable securities and other debt securities	44		111
Total noncurrent financial assets	258		256
Senior Notes	(2,370)		(2,302)
Commercial paper	(1,072)		(834)
Other long-term debt	(122)		(124)
Other noncurrent liabilities	(57)		(50)
Total noncurrent financial liabilities	$ (3,621)		$ (3,310)

[1] See Footnote No. 17, “Related Party Transactions,” to our Consolidated Financial Statements for disclosure of related party amounts.