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Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Operating Leases of Lessee Disclosure | 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 |  |  |
Electricity Purchase Contract Commitment | 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 Description of key provisions of an arrangement under which the entity has agreed to purchase electricity over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount + References No definition available. + Details
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- Definition Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + 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=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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