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Inventory (Tables) | 3 Months Ended
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Mar. 31, 2016
Inventory Disclosure [Abstract] |
Inventory Balance By Type | The following table summarizes the Company’s inventory balances as of the periods indicated (in millions):
| March 31, 2016 |  | December 31, 2015
Fuel and other raw materials | $ | 354 |  |  | $ | 343 |
Spare parts and supplies | 328 |  |  | 332 |
Total | $ | 682 |  |  | $ | 675 |

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- Definition Tabular disclosure of inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle including inventoried costs relating to long-term contracts or programs. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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