Amounts in Paragraphs - Debt (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Credit Facility, Covenant Terms, Maximum Debt to Capitalization Ratio	The company also cannot permit the ratio of its debt to capitalization (as set forth in the credit agreement) to exceed 65 percent.
Line of Credit Facility, Covenant Compliance	the company was in compliance with all covenants under its credit agreement.
Long-term Debt, Fair Value	$ 15,300	$ 13,400
Interest paid, net of interest received	475	437	$ 474
Interest Costs Capitalized	113	95	$ 53
Five Year Term [Member] [Domain]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,500
Credit facilities	0
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial Paper, Maximum Borrowing Capacity	2,500
Short-term Debt	$ 0	$ 0