Basis of Accounting Presentation Basis of Accounting Presentation (Details) |
9 Months Ended |
|---|---|
|
Sep. 30, 2015
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% |
| 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% |