Derivative Financial instruments and Risk Management- Effect of net settlement provisions upon default or termination- Offsetting liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Offsetting Liabilities
Gross Amount of Recognized Liabilities	$ (105)	$ (298)
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Liabilities Presented in the Statement of Financial Position	(105)	(298)
Financial Instruments	92	95
Cash collateral pledged	0	0
Net Amount of Liabilities	(13)	(203)
Machinery, Energy & Transportation
Offsetting Liabilities
Gross Amount of Recognized Liabilities	(64)	(38)
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Liabilities Presented in the Statement of Financial Position	(64)	(38)
Financial Instruments	53	38
Cash collateral pledged	0	0
Net Amount of Liabilities	(11)	0
Financial Products
Offsetting Liabilities
Gross Amount of Recognized Liabilities	(41)	(260)
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Liabilities Presented in the Statement of Financial Position	(41)	(260)
Financial Instruments	39	57
Cash collateral pledged	0	0
Net Amount of Liabilities	$ (2)	$ (203)