Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Aug. 02, 2022
Noncontrolling Interest [Line Items]
Stock repurchase program, authorized amount	$ 60,050
Stock repurchase plan remaining authorized amount	7,750
MPLX
Noncontrolling Interest [Line Items]
Stock repurchase plan remaining authorized amount	$ 520
MPLX | Share Repurchase Authorization August 2022
Noncontrolling Interest [Line Items]
Stock repurchase program, authorized amount		$ 1,000