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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Net cash provided by operating activities included:    
Interest paid (net of amounts capitalized) $ 590 $ 602
Net income taxes paid to (received from) taxing authorities 119 [1] 191
Income tax credits and adjustments 111  
Non-cash investing and financing activities:    
Contribution of assets $ 115 [2] $ 0
[1] 2025 includes $111 million paid to third parties for transferable tax credits.
[2] Represents the book value of assets contributed by MPLX to a joint venture.