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Acquisitions, Disposals and Other Transactions - Schedule of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
Feb. 29, 2016
Assets acquired:      
Goodwill $ 3,889 $ 3,714  
iProperty Group Limited [Member]      
Assets acquired:      
Goodwill     $ 498
Intangible assets     72
Net Liabilities     (34)
Net assets acquired     $ 536