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Commitments | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
COMMITMENTS | COMMITMENTS LEASES — The Company enters into long-term non-cancelable lease arrangements which, for accounting purposes, are classified as either operating or capital leases. Operating leases primarily include certain transmission lines, office rental and site leases. Operating lease rental expense for the years ended December 31, 2017, 2016, and 2015 was $61 million, $61 million and $45 million, respectively. Capital leases primarily include transmission lines, vehicles, offices, and other operating equipment. Capital leases are recognized in Property, Plant and Equipment within Electric generation, distribution assets and other. The gross value of the capital lease assets as of December 31, 2017 and 2016 was $27 million and $22 million, respectively. The following table shows the future minimum lease payments under operating and capital leases for continuing operations together with the present value of the net minimum lease payments under capital leases as of December 31, 2017 for 2018 through 2022 and thereafter (in millions):
| Future Commitments for
December 31, | Capital Leases |  | Operating Leases
2018 | $ | 2 |  |  | $ | 58 |
2019 | 1 |  |  | 58 |
2020 | 1 |  |  | 58 |
2021 | 1 |  |  | 59 |
2022 | 1 |  |  | 58 |
Thereafter | 12 |  |  | 644 |
Total | $ | 18 |  |  | $ | 935 |
Less: Imputed interest | (10 | ) |  |
Present value of total minimum lease payments | $ | 8 |  |  |
CONTRACTS — The Company enters into long-term contracts for construction projects, maintenance and service, transmission of electricity, operations services and purchase of electricity and fuel. In general, these contracts are subject to variable quantities or prices and are terminable only in limited circumstances. The following table shows the future minimum commitments for continuing operations under these contracts as of December 31, 2017 for 2018 through 2022 and thereafter as well as actual purchases under these contracts for the years ended December 31, 2017, 2016, and 2015 (in millions):
Actual purchases during the year ended December 31, | Electricity Purchase Contracts |  | Fuel Purchase Contracts |  | Other Purchase Contracts
2015 | $ | 545 |  |  | $ | 1,262 |  |  | $ | 1,833 |
2016 | 420 |  |  | 1,790 |  |  | 817 |
2017 | 747 |  |  | 1,619 |  |  | 1,945 |
Future commitments for the year ending December 31, |  |  |  |  |
2018 | $ | 581 |  |  | $ | 1,759 |  |  | $ | 1,488 |
2019 | 508 |  |  | 1,051 |  |  | 931 |
2020 | 440 |  |  | 591 |  |  | 470 |
2021 | 469 |  |  | 538 |  |  | 234 |
2022 | 438 |  |  | 454 |  |  | 547 |
Thereafter | 2,065 |  |  | 1,466 |  |  | 1,314 |
Total | $ | 4,501 |  |  | $ | 5,859 |  |  | $ | 4,984 |

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- Definition The entire disclosure for significant arrangements with third parties, which includes operating lease arrangements and arrangements in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services, and operating lease arrangements. Descriptions may include identification of the specific goods and services, period of time covered, minimum quantities and amounts, and cancellation rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details
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