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Sale of Data Centers and Colocation Business - Assets Sold to and Liabilities Assumed (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
May 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Less assets not removed as a result of the failed-sale-leaseback $ (53,267) $ (51,204)  
Assets held for sale $ 12 $ 140  
Colocation Business and Data Centers | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Goodwill     $ 1,142
Property, plant and equipment     1,051
Other intangible assets     249
Other assets     66
Less assets not removed as a result of the failed-sale-leaseback     (526)
Assets held for sale     1,982
Capital lease obligations     294
Other liabilities     274
Less imputed financing obligations from the failed-sale-leaseback     (628)
Total net imputed liabilities recognized     $ (60)