Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Schedule of capital lease activity

The tables below summarize our capital lease activity:

	Years Ended December 31,
	2014		2013	2012
	(Dollars in millions)
Assets acquired through capital leases	$	37	12	209
Depreciation expense	126		136	150
Cash payments towards capital leases	118		119	113

	As of December 31,
	2014		2013
	(Dollars in millions)
Assets included in property, plant and equipment	$	850	877
Accumulated depreciation	393		338

Schedule of future annual minimum payments under capital lease arrangements

The future annual minimum payments under capital lease arrangements as of December 31, 2014 were as follows:

	Future Minimum Payments
	(Dollars in millions)
Capital lease obligations:
2015	$	104
2016	76
2017	74
2018	72
2019	61
2020 and thereafter	284
Total minimum payments	671
Less: amount representing interest and executory costs	(182		)
Present value of minimum payments	489
Less: current portion	(73		)
Long-term portion	$	416

Schedule of future rental commitments for operating leases

At December 31, 2014, our future rental commitments for operating leases were as follows:

	Future Minimum Payments
	(Dollars in millions)
2015	$	311
2016	280
2017	257
2018	233
2019	202
2020 and thereafter	974
Total future minimum payments (1)	$	2,257

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⁽¹⁾  Minimum payments have not been reduced by minimum sublease rentals of $91 million due in the future under non-cancelable subleases.