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Commitments (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 for 2017 through 2021 and thereafter (in millions):
| Future Commitments for
December 31, | Capital Leases |  | Operating Leases
2017 | $ | 25 |  |  | $ | 84 |
2018 | 18 |  |  | 90 |
2019 | 14 |  |  | 91 |
2020 | 11 |  |  | 92 |
2021 | 8 |  |  | 91 |
Thereafter | 89 |  |  | 926 |
Total | $ | 165 |  |  | $ | 1,374 |
Less: Imputed interest | (96 | ) |  |
Present value of total minimum lease payments | $ | 69 |  |  |
Electricity Purchase Contract Commitment | The following table shows the future minimum commitments for continuing operations under these contracts as of December 31, 2016 for 2017 through 2021 and thereafter as well as actual purchases under these contracts for the years ended December 31, 2016, 2015, and 2014 (in millions):
Actual purchases during the year ended December 31, | Electricity Purchase Contracts |  | Fuel Purchase Contracts |  | Other Purchase Contracts
2014 | $ | 2,475 |  |  | $ | 1,521 |  |  | $ | 1,367 |
2015 | 2,120 |  |  | 1,262 |  |  | 2,110 |
2016 | 2,447 |  |  | 1,790 |  |  | 1,093 |
Future commitments for the year ending December 31, |  |  |  |  |
2017 | $ | 2,513 |  |  | $ | 1,609 |  |  | $ | 2,966 |
2018 | 2,507 |  |  | 724 |  |  | 1,865 |
2019 | 2,367 |  |  | 489 |  |  | 1,395 |
2020 | 2,704 |  |  | 451 |  |  | 956 |
2021 | 2,750 |  |  | 465 |  |  | 815 |
Thereafter | 20,265 |  |  | 1,425 |  |  | 6,012 |
Total | $ | 33,106 |  |  | $ | 5,163 |  |  | $ | 14,009 |

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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 of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + 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 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=6584154&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=6452660&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=6453985&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=6851643&loc=d3e12069-110248 + Details
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