Supplemental Cash Flow Disclosures - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Income Statements, Captions [Line Items]
Interest paid, net of amounts capitalized	$ 2,071	$ 2,041	$ 1,855
Income taxes received, net	1,863	1,309	1,361
Accruals related to property, plant and equipment additions	1,049	834	801
MEC
Condensed Income Statements, Captions [Line Items]
Interest paid, net of amounts capitalized	292	279	286
Income taxes received, net	840	746	709
Accruals related to property, plant and equipment additions	$ 168	$ 257	$ 227