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Sale of Data Centers and Colocation Business - Additional Information (Details) - USD ($)
$ in Millions
4 Months Ended 12 Months Ended 16 Months Ended
May 01, 2017
May 01, 2017
Dec. 31, 2017
Dec. 31, 2016
May 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Disposal group, gain (loss) on disposal     $ 20    
Cyxtera Technologies          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain (Loss) on asset leaseback, failed-sale-leaseback transaction     102    
Sale and leaseback transaction loss, net     82    
SIS Holdings, LP          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Noncontrolling interest in limited partnerships $ 150 $ 150     $ 150
Colocation Business and Data Centers          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net proceeds from sales of colocation business and data centers $ 1,800        
Tax effect of gain (loss) from disposal of discontinued operation     $ 47 $ 18 $ 65
Depreciation and amortization   $ 67