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Notes Receivable - Composition of our Notes Receivable Balances (Net of Reserves and Unamortized Discounts) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Receivables [Abstract]    
Senior, mezzanine, and other loans $ 245us-gaap_NotesReceivableNet $ 242us-gaap_NotesReceivableNet
Less current portion (91)us-gaap_NotesAndLoansReceivableNetCurrent (27)us-gaap_NotesAndLoansReceivableNetCurrent
Notes receivable, noncurrent $ 154us-gaap_NotesAndLoansReceivableNetNoncurrent $ 215us-gaap_NotesAndLoansReceivableNetNoncurrent