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Composition of our Notes Receivable Balances (Net of Reserves) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Senior, mezzanine, and other loans $ 242us-gaap_NotesReceivableNet $ 178us-gaap_NotesReceivableNet
Current notes receivable (27)us-gaap_NotesAndLoansReceivableNetCurrent (36)us-gaap_NotesAndLoansReceivableNetCurrent
Notes receivable, noncurrent $ 215us-gaap_NotesAndLoansReceivableNetNoncurrent $ 142us-gaap_NotesAndLoansReceivableNetNoncurrent