Sale of Data Centers and Colocation Business (Details 2) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Sale Leaseback Transaction [Line Items]
Revenues	$ 4,090	$ 4,398	$ 8,299	$ 8,799
Cost of services and products (exclusive of depreciation and amortization)	(1,890)	(1,949)	(3,778)	(3,849)
Selling, general and administrative	(884)	(815)	(1,694)	(1,652)
Depreciation	(949)	(987)	(1,829)	(1,963)
Interest expense	(320)	(340)	(638)	(671)
Income tax expense	(23)	(121)	(167)	(265)
NET INCOME	17	$ 196	180	$ 432
Cyxtera Technologies
Sale Leaseback Transaction [Line Items]
Revenues	12		12
Cost of services and products (exclusive of depreciation and amortization)	3		3
Selling, general and administrative	(117)		(117)
Depreciation expense on assets reclassified from held-for-sale	(44)		(44)
Depreciation	(10)		(10)
Interest expense	(8)		(8)
Income tax expense	63		63
NET INCOME	$ (101)		$ (101)