Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Summary of the entity's 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	$	3	—	—
Depreciation expense	32		42	50
Cash payments towards capital leases	32		40	41

	As of December 31,
	2014		2013
	(Dollars in millions)
Assets included in property, plant and equipment	$	137	168
Accumulated depreciation	108		109

Schedule of future annual minimum payments under capital lease

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	$	22
2016	2
2017	1
2018	1
2019	1
2020 and thereafter	7
Total minimum payments	34
Less: amount representing interest and executory costs	(8		)
Present value of minimum payments	26
Less: current portion	(20		)
Long-term portion	$	6

Schedule of future minimum payments under operating leases

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

	Future Minimum Payments
	(Dollars in millions)
Operating leases:
2015	$	56
2016	50
2017	44
2018	38
2019	27
2020 and thereafter	36
Total future minimum payments(1)	$	251

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⁽¹⁾  Minimum payments have not been reduced by minimum sublease rentals of $30 million due in the future under non-cancelable subleases.