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Income Taxes (Notes)
6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block]
INCOME TAXES
The Partnership’s effective tax rate differs from the statutory rate primarily due to partnership earnings that are not subject to United States federal and most state income taxes at the partnership level. For the three and six months ended June 30, 2018, the Partnership’s income tax benefit also reflected $13 million and $51 million, respectively, of deferred benefit adjustments as the result of a state statutory rate reduction.