Other Financial Information (Details 2) (Qwest Communications International Inc, KPNQwest) In Millions, unless otherwise specified	1 Months Ended
Feb. 27, 2014 USD ($)	Feb. 27, 2014 EUR (€)	Dec. 31, 2014 USD ($)
Commitments and Contingencies
Payments for legal settlements	$ 235	€ 171
Legal reserve, KPNQwest litigation settlement			$ 235

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

Name:	us-gaap_PaymentsForLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration