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Redeemable Noncontrolling Interest - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Temporary Equity [Abstract]            
Beginning balance $ 1,005 $ 1,004 $ 1,004 $ 1,003 $ 1,000 $ 1,000
Net income attributable to redeemable noncontrolling interest 20 21 20 19 20 16
Distributions to noncontrolling interests (21) (20) (20) (19) (17) (16)
Equity transactions of MPLX & ANDX (36)          
Ending balance $ 968 $ 1,005 $ 1,004 $ 1,003 $ 1,003 $ 1,000