Supplemental Cash Flow Disclosures - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Income Statements, Captions [Line Items]
Interest paid, net of amounts capitalized	$ 2,304	$ 2,109	$ 2,071
Income taxes received, net	1,501	1,370	1,863
Accruals related to property, plant and equipment additions	1,337	1,494	1,049
MEC
Condensed Income Statements, Captions [Line Items]
Interest paid, net of amounts capitalized	374	300	292
Income taxes received, net	898	852	840
Accruals related to property, plant and equipment additions	$ 108	$ 193	$ 168