Long-Term Debt and Credit Facilities (Details 4) - USD ($) $ in Millions		4 Months Ended
		Apr. 30, 2018	Dec. 31, 2017
Long-term Debt, Fiscal Year Maturity [Abstract]
2018	[1]		$ 443
2019	[1]		638
2020	[1]		1,194
2021	[1]		3,109
2022	[1]		5,033
2023 and thereafter	[1]		27,137
Total long-term debt			37,554
Data Centers Financing Obligation
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term debt			$ 598
Data Centers Financing Obligation | Scenario, Forecast
Long-term Debt, Fiscal Year Maturity [Abstract]
Total long-term debt		$ 499
Future imputed lease income		$ (173)

[1] The amount outstanding on the data centers obligation at December 31, 2017 was $598 million. The aggregate maturities of long-term debt do not include $499 million of this obligation, which, at the end of the lease term on April 30, 2020, will be derecognized along with the remaining net book value of the associated real estate assets. Also, the aggregate maturities of long-term debt do not include future imputed lease income of $173 million attributable to the accounting for certain of the real estate assets under the failed-sale-leaseback. See Note 3—Sale of Data Centers and Colocation Business for additional information.