Long-term debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Long-term Debt
Face amount, medium term note reclassified	$ 1,250
Interest paid on short-term and long-term borrowings	1,738	$ 1,435	$ 959
Medium-Term Note
Long-term Debt
Debt instrument	1,250
Medium-Term Note, 2030
Long-term Debt
Debt instrument	450
Medium-Term Note, 2027
Long-term Debt
Debt instrument	800
Medium Term Note mature in 2024
Long-term Debt
Medium-term notes excluded from current maturity of long-term debt	$ 1,250
Financial Products
Long-term Debt
Medium-term notes, interest rate	4.00%
Medium-term Notes, remaining maturity	5 years