XML 47 R30.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Inventory (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2014
Inventory Disclosure [Abstract] |
Inventory Balance By Type | The following table summarizes the Company’s inventory balances as of the periods indicated:
|  | June 30, 2014 |  | December 31, 2013
|  | (in millions)
Coal, fuel oil and other raw materials |  | $ | 346 |  |  | $ | 334 |
Spare parts and supplies |  | 364 |  |  | 350 |
Total |  | $ | 710 |  |  | $ | 684 |

X
- Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
Name: | us-gaap_ScheduleOfInventoryNoncurrentTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration