Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets Parentheticals

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Consolidated Balance Sheets Parentheticals - shares
shares in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
General Partner Ownership Interest Percentage 2.00% 2.00%
General Partners' Capital Account, Units Issued 9.9 9.9
General Partners' Capital Account, Units Outstanding 9.9 9.9
Common Units [Member]    
Limited Partners' Capital Account, Units Issued 348.6 348.6
Limited Partners' Capital Account, Units Outstanding 348.6 348.6
Subordinated Units [Member]    
Limited Partners' Capital Account, Units Issued 135.4 135.4
Limited Partners' Capital Account, Units Outstanding 135.4 135.4