Derivative financial instruments and risk management (Details 5) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Offsetting Assets
Gross Amount of Recognized Assets	$ 342	$ 281
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	342	281
Financial Instruments	(114)	(95)
Cash Collateral Received	0	0
Net Amount of Assets	228	186
Machinery, Energy & Transportation
Offsetting Assets
Gross Amount of Recognized Assets	134	196
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	134	196
Financial Instruments	(47)	(38)
Cash Collateral Received	0	0
Net Amount of Assets	87	158
Financial Products
Offsetting Assets
Gross Amount of Recognized Assets	208	85
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	208	85
Financial Instruments	(67)	(57)
Cash Collateral Received	0	0
Net Amount of Assets	$ 141	$ 28