COMMITMENTS AND CONTINGENCIES (Material Components Underlying Estimated Loss for Cleanup, Remediation and Restoration) (Details) - Line Six Marshall Leak [Member] $ in Millions	Jun. 30, 2015 USD ($)
Estimated total loss of crude oil release	$ 1,208.0
Response Personnel and Equipment [Member]
Estimated total loss of crude oil release	549.5
Environmental Consultants [Member]
Estimated total loss of crude oil release	227.0
Professional, Regulatory and Other [Member]
Estimated total loss of crude oil release	$ 431.5