Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Mar. 31, 2011 Predecessor	Dec. 31, 2010 Predecessor	Apr. 02, 2011 Acquisition of QCII, amounts attributable to Qwest CenturyLink, Inc.
Accounts receivable
Trade and purchased receivables	$ 660	$ 661
Earned and unbilled receivables	81	82
Other	8	12
Total accounts receivable	749	755			(47)
Less: allowance for doubtful accounts	(42)	(46)
Accounts receivable, less allowance	707	709
Changes in allowance for doubtful accounts
Balance at the beginning of the period		42	48	53
Charged to expense-net	44	74	17	70
Deductions	(2)	(70)	(18)	(75)
Balance at the end of the period	42	46	47	48
Additional disclosure
Fair value adjustment					$ (47)