Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Period Type:	duration

Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Aug. 02, 2022	Nov. 02, 2020
Noncontrolling Interest [Line Items]
Stock repurchase plan remaining authorized amount	$ 3,330
Share Repurchase Authorization August 2022
Noncontrolling Interest [Line Items]
Stock repurchase program, authorized amount				$ 5,000
MPLX
Noncontrolling Interest [Line Items]
Stock repurchase program, authorized amount					$ 1,000
Stock repurchase plan remaining authorized amount	$ 846
Number of common units repurchased	15	23	1
Cash paid for common units repurchased	$ 491	$ 630	$ 33
MPLX \| Share Repurchase Authorization August 2022
Noncontrolling Interest [Line Items]
Stock repurchase program, authorized amount				$ 1,000