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Property and Equipment Property and Equipment (Table Footnote) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and amortization $ (13,185.8) $ (14,574.8)
Property and equipment, at cost 34,443.4 $ 37,692.4
China and Hong Kong Held for Sale    
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and amortization (1,200.0)  
Property and equipment, at cost $ 2,300.0