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Acquisitions and Investments - Acquisition of Ozark Pipeline (Details) - Ozark Pipeline
bbl / d in Thousands, $ in Millions
Mar. 01, 2017
USD ($)
bbl / d
in
mi
Business Acquisition [Line Items]  
Pipeline length | mi 433
Pipeline diameter | in 22
Crude oil throughput | bbl / d 230
MPLX LP  
Business Acquisition [Line Items]  
Payments to acquire business, gross | $ $ 220