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Long-term debt (Details) - USD ($) $ in Millions	12 Months Ended
Long-term debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	May 12, 2025
Long-term Debt
Face amount, medium term note reclassified	$ 1,750
Interest paid on short-term and long-term borrowings	1,842	$ 1,738	$ 1,435
Medium-Term Note
Long-term Debt
Debt instrument	1,750
Medium-Term Note, 2030
Long-term Debt
Debt instrument	500
Medium-Term Note, 2027
Long-term Debt
Debt instrument	1,250
Medium Term Note mature in 2024
Long-term Debt
Medium-term notes excluded from current maturity of long-term debt	$ 1,750
Senior Notes Due 2035 \| Senior Notes
Long-term Debt
Debt instrument				$ 1,700
Debt instrument, interest rate (as a percent)				5.20%
Senior Notes Due 2055 \| Senior Notes
Long-term Debt
Debt instrument				$ 300
Debt instrument, interest rate (as a percent)				5.50%
Financial Products
Long-term Debt
Medium-term notes, interest rate	3.80%
Medium-term notes, remaining maturity	5 years