Derivative financial instruments and risk management (Details 6) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Offsetting Liabilities
Gross Amount of Recognized Liabilities	$ (130)	$ (298)
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Liabilities Presented in the Statement of Financial Position	(130)	(298)
Financial Instruments	114	95
Cash Collateral Pledged	0	0
Net Amount of Liabilities	16	203
Machinery, Energy & Transportation
Offsetting Liabilities
Gross Amount of Recognized Liabilities	(47)	(38)
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Liabilities Presented in the Statement of Financial Position	(47)	(38)
Financial Instruments	47	38
Cash Collateral Pledged	0	0
Net Amount of Liabilities	0	0
Financial Products
Offsetting Liabilities
Gross Amount of Recognized Liabilities	(83)	(260)
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Liabilities Presented in the Statement of Financial Position	(83)	(260)
Financial Instruments	67	57
Cash Collateral Pledged	0	0
Net Amount of Liabilities	$ 16	$ 203