Events Associated with the Amalgamation of Global Crossing (Details) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended			1 Months Ended	12 Months Ended		0 Months Ended	1 Months Ended			0 Months Ended
	Oct. 19, 2011	Mar. 31, 2011	Mar. 31, 2012	Oct. 04, 2011	Oct. 03, 2011	Oct. 31, 2011 Senior Secured Term Loan Tranche B II Term Loan	Dec. 31, 2011 Senior Notes due 2019 (8.125%)	Mar. 31, 2012 Senior Notes due 2019 (8.125%)	Oct. 04, 2011 Common stock	Oct. 31, 2011 Common stock	Nov. 30, 2011 Global Crossing	Oct. 04, 2011 Global Crossing	Oct. 04, 2011 Global Crossing 2% Cumulative convertible preferred stock
Acquisition
Amalgamation stock exchange ratio (in shares)									16
Preferred stock dividend rate (as a percent)													2.00%
Additional principal amount of debt issued						$ 650,000,000
Proceeds from issuance of 8.125% Senior Notes due 2019 in June and July 2011							1,200,000,000
Debt instrument, stated interest rate (as a percent)								8.125%
Shares issued in Amalgamation transaction (in shares)										88,530,000
Reverse stock split ratio (in shares)	15
Amount of outstanding debt redeemed and refinanced											1,360,000,000
Closing stock price					$ 21.15
Estimated total Amalgamation transaction consideration			3,400,000,000
Cash Paid for Employee Income and Payroll Tax Witholdings	81,000,000
Initial Purchase Price Allocation [Abstract]
Cash, Cash Equivalents, and Restricted Cash				226,000,000
Property, Plant, and Equipment				3,098,000,000
Goodwill				1,069,000,000
Identifiable Intangibles				106,000,000
Other Assets				680,000,000
Total Assets				5,179,000,000
Long-term Debt				(1,554,000,000)
Other Liabilities				(1,663,000,000)
Total Liabilities				(3,217,000,000)
Total Estimated Consideration				1,962,000,000
Business Acquisition, Purchase Price Allocation, Reduction Due to Un Amortizable Deferred Revenue												77,000,000
Pro Forma Financial Information [Abstract]
Total Revenue		1,548,000,000
Net Loss		(232,000,000)
Net Loss per share (in dollars per share)		$ (1.16)
Acquisition related costs incurred			49,000,000
Acquisition related integration costs			$ 47,000,000