Derivative Financial instruments and Risk Management-Effect of net settlement provisions upon default or termination- Offsetting assets (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Offsetting Assets
Gross Amount of Recognized Assets	$ 300	$ 281
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	300	281
Financial Instruments	(114)	(95)
Cash Collateral Received	0	0
Net Amount of Assets	186	186
Machinery, Energy & Transportation
Offsetting Assets
Gross Amount of Recognized Assets	158	196
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	158	196
Financial Instruments	(59)	(38)
Cash Collateral Received	0	0
Net Amount of Assets	99	158
Financial Products
Offsetting Assets
Gross Amount of Recognized Assets	142	85
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	142	85
Financial Instruments	(55)	(57)
Cash Collateral Received	0	0
Net Amount of Assets	$ 87	$ 28