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. 01, 2011 Fair value adjustment CenturyLink
Accounts receivable
Trade and purchased receivables	$ 1,015	$ 1,028
Earned and unbilled receivables	217	208
Other	31	17
Total accounts receivable	1,263	1,253
Less: allowance for doubtful accounts	(62)	(76)
Accounts receivable, less allowance	1,201	1,177
Changes in allowance for doubtful accounts
Balance at the beginning of the period		62	83	100
Charged to expense-net	62	94	19	86
Deductions		(78)	(22)	(103)
Adjustments		(2)
Balance at the end of the period	62	76	80	83
Additional disclosure
Fair value adjustment					$ (80)