Basis of Accounting Presentation (Narrative) (Details)
|
3 Months Ended |
|
Mar. 31, 2016
mi
|
|---|
| Basis Of Accounting Presentation [Line Items] |
|
| Pipeline Miles |
15,000
|
| Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |
15.70%
|
| Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Additional Ownership Interest |
46.50%
|
| Corporate Joint Venture [Member] |
|
| Basis Of Accounting Presentation [Line Items] |
|
| Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest |
84.30%
|