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Commitments and Contingencies (Tables) | 12 Months Ended
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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 |
_______________________________________________________________________________
(1) | Minimum payments have not been reduced by minimum sublease rentals of $30 million due in the future under non-cancelable subleases.

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- Definition Tabular disclosure of the capital lease activity. The disclosure may include details of assets acquired through capital leases during the period, depreciation expenses recorded during the period on capital leased assets, cash payments during the period against capital lease obligations, gross and net amounts of capital leased assets held as of the balance sheet date and related accumulated depreciation. + References No definition available. + Details
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- Definition Tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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