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CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY (USD $)
In Millions, unless otherwise specified
Total
COMMON STOCK
ACCUMULATED DEFICIT
Balance at beginning of period at Dec. 31, 2013   $ 10,050us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (437)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Retained Earnings (Accumulated Deficit) [Abstract]      
Net income 253us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic   253us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Dividends declared to Qwest Services Corporation     (300)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at end of period at Mar. 31, 2014 9,566us-gaap_StockholdersEquity 10,050us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(484)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at beginning of period at Dec. 31, 2014 9,183us-gaap_StockholdersEquity 10,050us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(867)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Retained Earnings (Accumulated Deficit) [Abstract]      
Net income 247us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic   247us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Dividends declared to Qwest Services Corporation     (300)us-gaap_DividendsCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at end of period at Mar. 31, 2015 $ 9,130us-gaap_StockholdersEquity $ 10,050us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (920)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember