Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2016		2015	2014
	(Dollars in millions)
Assets acquired through capital leases	$	10	10	3
Depreciation expense	5		19	32
Cash payments towards capital leases	6		20	32

	As of December 31,
	2016		2015
	(Dollars in millions)
Assets included in property, plant and equipment	$	40	66
Accumulated depreciation	22		55

Schedule of future annual minimum payments under capital lease

The future annual minimum payments under capital lease arrangements as of December 31, 2016 were as follows:

	Future Minimum Payments
	(Dollars in millions)
Capital lease obligations:
2017	$	7
2018	7
2019	4
2020	1
2021	2
2022 and thereafter	5
Total minimum payments	26
Less: amount representing interest and executory costs	(7		)
Present value of minimum payments	19
Less: current portion	(6		)
Long-term portion	$	13

Schedule of future minimum payments under operating leases

At December 31, 2016, our future rental commitments for operating leases were as follows:

	Future Minimum Payments
	(Dollars in millions)
Operating leases:
2017	$	51
2018	47
2019	40
2020	33
2021	17
2022 and thereafter	38
Total future minimum payments(1)	$	226

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⁽¹⁾  Minimum payments have not been reduced by minimum sublease rentals of $28 million due in the future under non-cancelable subleases.