Subsequent Event Subsequent Event

6 Months Ended

Jun. 30, 2014

Subsequent Events [Abstract]

Subsequent Events

Subsequent Event

Southern Access Extension Pipeline project

In July 2014, we exercised our option to acquire a 35 percent ownership interest in Enbridge Inc.'s Southern Access Extension pipeline ("SAX") through our investment in Illinois Extension Pipeline Company, LLC ("Illinois Extension Pipeline"). During July, we made an initial contribution of $69 million to Illinois Extension Pipeline to fund our portion of the construction costs incurred-to-date on the SAX project. In return for our investment in the SAX project, we received a 35 percent equity interest in Illinois Extension Pipeline. We expect to make future contributions of approximately $226 million related to the ongoing construction of the pipeline, which is expected to be operational in mid 2015.