Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2015		2014	2013
	(Dollars in millions)
Assets acquired through capital leases	$	10	3	—
Depreciation expense	19		32	42
Cash payments towards capital leases	20		32	40

	As of December 31,
	2015		2014
	(Dollars in millions)
Assets included in property, plant and equipment	$	66	137
Accumulated depreciation	55		108

Schedule of future annual minimum payments under capital lease

The future annual minimum payments under capital lease arrangements as of December 31, 2015 were as follows:

	Future Minimum Payments
	(Dollars in millions)
Capital lease obligations:
2016	$	8
2017	4
2018	4
2019	2
2020	—
2021 and thereafter	5
Total minimum payments	23
Less: amount representing interest and executory costs	(7		)
Present value of minimum payments	16
Less: current portion	(6		)
Long-term portion	$	10

Schedule of future minimum payments under operating leases

At December 31, 2015, our future rental commitments for operating leases were as follows:

	Future Minimum Payments
	(Dollars in millions)
Operating leases:
2016	$	56
2017	50
2018	45
2019	37
2020	32
2021 and thereafter	52
Total future minimum payments(1)	$	272

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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.