Segment Information (Details 2) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Segment information
Net loss	$ (181)	$ (169)	$ (386)	$ (407)
Income tax expense	3		30	1
Total other (income) expense	180	141	354	337
Depreciation and amortization expense	207	223	411	448
Non-cash compensation expense	17	14	42	30
Reportable segments
Segment information
Net loss	(179)	(168)	(381)	(405)
Communications Segment
Segment information
Net loss	(178)	(167)	(379)	(402)
Income tax expense	3		30	1
Total other (income) expense	178	140	349	336
Depreciation and amortization expense	206	222	409	446
Non-cash compensation expense	17	14	42	30
Adjusted EBITDA	226	209	451	411
Coal Mining Segment
Segment information
Net loss	(1)	(1)	(2)	(3)
Total other (income) expense				(1)
Depreciation and amortization expense	1	1	2	2
Adjusted EBITDA				(2)
Unallocated corporate expense
Segment information
Net loss	$ (2)	$ (1)	$ (5)	$ (2)