Commitments and Contingencies (Details) In Millions, unless otherwise specified	0 Months Ended	1 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended
	Jul. 16, 2013 Comcast USD ($)	Sep. 30, 2010 KPNQwest, N.V. tort and mismanagement claims under Dutch law EUR (€) lawsuit	Sep. 30, 2013 KPNQwest, N.V. tort and mismanagement claims under Dutch law USD ($)	Sep. 30, 2013 KPNQwest, N.V. tort and mismanagement claims under Dutch law EUR (€)	Sep. 30, 2006 Cargill Financial Markets, Plc and Citibank, N.A. EUR (€)	Sep. 30, 2013 Cargill Financial Markets, Plc and Citibank, N.A. USD ($)	Sep. 30, 2013 Fiber-optic cable installation state lawsuit
Commitments and Contingencies
Damages sought by plaintiff	$ 80	€ 4,200	$ 5,700		€ 219	$ 296
Loss Contingency, Estimate of Possible Loss			233	172
Loss Contingency, Loss in Period			$ 233	€ 172
Number of lawsuits previously filed and dismissed (lawsuits)		2
Number of states in which several putative class actions relating to the installation of fiber-optic cable were filed against the entity (states)							34
Number of lawsuits previously filed (lawsuits)							1
Number of states in which the entity has received final approval of settlements in connection with several putative class actions (states)							29
Number of states in which preliminary approval of settlements have been received (states)							1
Number of States in which Preliminary or Final Approval of Settlements have not been Received							1
Number of states in which actions are not currently pending (states)							3