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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 17, 2016, SEP issued $800 million aggregate principal amount of senior unsecured notes, comprised of $600 million of 3.375% senior notes due 2026 and $200 million of 4.5% senior notes due 2045. The new 2045 notes are an additional issuance of SEP’s 4.5% senior notes issued in March 2015. Net proceeds from the offering were used to repay a portion of outstanding commercial paper, to fund capital expenditures and for general corporate purposes.