XML 55 R48.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Inventories (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Inventory Disclosure [Abstract] |
Schedule of Utility Inventory |
(in millions) | 2016 |  | 2015 |
Materials and supplies | $ | 244 |  | $ | 194 |
Gas and fuel in storage | 98 |  | 101 |
Coal inventory | 30 |  | 42 |
| $ | 372 |  | $ | 337 |

X
- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of all information related to inventories for utilities. + 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 210.5-05.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_ScheduleOfUtilityInventoryTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration