Derivative financial instruments and risk management (Details 5) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Offsetting Assets
Gross Amount of Recognized Assets	$ 116	$ 131
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	116	131
Financial Instruments	(34)	(53)
Cash Collateral Received	0	0
Net Amount of Assets	82	78
Machinery, Energy & Transportation
Offsetting Assets
Gross Amount of Recognized Assets	32	19
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	32	19
Financial Instruments	(13)	(19)
Cash Collateral Received	0	0
Net Amount of Assets	19	0
Financial Products
Offsetting Assets
Gross Amount of Recognized Assets	84	112
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	84	112
Financial Instruments	(21)	(34)
Cash Collateral Received	0	0
Net Amount of Assets	$ 63	$ 78