Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of 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	$	17	37	12
Depreciation expense	96		126	136
Cash payments towards capital leases	89		118	119

	As of December 31,
	2015		2014
	(Dollars in millions)
Assets included in property, plant and equipment	$	722	850
Accumulated depreciation	352		393

Schedule of future annual minimum payments under capital lease arrangements

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	$	85
2017	78
2018	76
2019	62
2020	47
2021 and thereafter	223
Total minimum payments	571
Less: amount representing interest and executory costs	(153		)
Present value of minimum payments	418
Less: current portion	(56		)
Long-term portion	$	362

Schedule of future rental commitments for operating leases

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

	Future Minimum Payments
	(Dollars in millions)
2016	$	301
2017	289
2018	268
2019	235
2020	209
2021 and thereafter	1,075
Total future minimum payments (1)	$	2,377

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⁽¹⁾  Minimum payments have not been reduced by minimum sublease rentals of $87 million due in the future under non-cancelable subleases.