Amounts in Paragraphs - Debt (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
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	$ 15,100	$ 15,300
Interest paid, net of interest received	588	475	$ 437
Interest Costs Capitalized	100	113	$ 95
2025 Five Year Term
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,000
Credit facilities	0
2022 Five Year Term
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		2,500
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial Paper, Maximum Borrowing Capacity (Prior)		2,500
Commercial Paper, Maximum Borrowing Capacity	3,000
Short-term Debt	$ 0	$ 0