Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of capital lease activity

The tables below summarize our capital lease activity:

	Years Ended December 31,
	2017		2016	2015
	(Dollars in millions)
Assets acquired through capital leases	$	35	45	17
Depreciation expense	50		70	96
Cash payments towards capital leases	48		58	89

	As of December 31,
	2017		2016
	(Dollars in millions)
Assets included in property, plant and equipment	$	342	705
Accumulated depreciation	153		351

Schedule of future annual minimum payments under capital lease arrangements

The future annual minimum payments under capital lease arrangements as of December 31, 2017 were as follows:

	Future Minimum Payments(1)
	(Dollars in millions)
Capital lease obligations:
2018	$	56
2019	45
2020	32
2021	25
2022	22
2023 and thereafter	203
Total minimum payments	383
Less: amount representing interest and executory costs	(117		)
Present value of minimum payments	266
Less: current portion	(40		)
Long-term portion	$	226

Schedule of future rental commitments for operating leases

At December 31, 2017, our future rental commitments for operating leases were as follows:

	Future Minimum Payments
	(Dollars in millions)
2018	$	666
2019	533
2020	467
2021	367
2022	326
2023 and thereafter	2,116
Total future minimum payments(1)	$	4,475

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⁽¹⁾  Minimum payments have not been reduced by minimum sublease rentals of $92 million due in the future under non-cancelable subleases.