Derivative Financial instruments and Risk Management-Effect of net settlement provisions upon default or termination- Offsetting assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Offsetting Assets
Gross Amount of Recognized Assets	$ 330	$ 281
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	330	281
Financial Instruments	(84)	(95)
Cash Collateral Received	0	0
Net Amount of Assets	246	186
Machinery, Energy & Transportation
Offsetting Assets
Gross Amount of Recognized Assets	194	196
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	194	196
Financial Instruments	(29)	(38)
Cash Collateral Received	0	0
Net Amount of Assets	165	158
Financial Products
Offsetting Assets
Gross Amount of Recognized Assets	136	85
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	136	85
Financial Instruments	(55)	(57)
Cash Collateral Received	0	0
Net Amount of Assets	$ 81	$ 28