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Acquisitions, Disposals and Other Transactions - Schedule of Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Feb. 29, 2016
Assets acquired:        
Goodwill $ 3,791   $ 3,714  
Wireless Group plc [Member]        
Assets acquired:        
Intangible assets   $ 213    
Goodwill   121    
Net liabilities   (49)    
Total net assets acquired   $ 285    
iProperty Group Limited [Member]        
Assets acquired:        
Intangible assets       $ 72
Goodwill       498
Net liabilities       (34)
Total net assets acquired       $ 536