Derivative Financial instruments and Risk Management-Effect of net settlement provisions upon default or termination- Offsetting assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Assets
Gross Amount of Recognized Assets	$ 332	$ 281
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	332	281
Financial Instruments	(92)	(95)
Cash Collateral Received	0	0
Net Amount of Assets	240	186
Machinery, Energy & Transportation
Offsetting Assets
Gross Amount of Recognized Assets	122	196
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	122	196
Financial Instruments	(53)	(38)
Cash Collateral Received	0	0
Net Amount of Assets	69	158
Financial Products
Offsetting Assets
Gross Amount of Recognized Assets	210	85
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	210	85
Financial Instruments	(39)	(57)
Cash Collateral Received	0	0
Net Amount of Assets	$ 171	$ 28