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Inventory | 3 Months Ended
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Mar. 31, 2017
Inventory Disclosure [Abstract] |
INVENTORY | INVENTORY The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
| March 31, 2017 |  | December 31, 2016
Fuel and other raw materials | $ | 329 |  |  | $ | 302 |
Spare parts and supplies | 316 |  |  | 328 |
Total | $ | 645 |  |  | $ | 630 |

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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