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Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Nov. 02, 2020
Units acquired, average cost per unit	$ 95.46	$ 63.00	$ 85.31	$ 63.00
Stock repurchase program, remaining authorized repurchase amount	$ 4,170		$ 4,170
MPLX LP
Stock repurchase program, authorized amount					$ 1,000
Units repurchased, units	1	6	4	12
Units repurchased, value	$ 35	$ 155	$ 135	$ 310
Units acquired, average cost per unit	$ 33.74	$ 27.40	$ 32.48	$ 26.02
Stock repurchase program, remaining authorized repurchase amount	$ 202		$ 202

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