Derivative Financial instruments and Risk Management-Effect of net settlement provisions upon default or termination- Offsetting assets (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Offsetting Assets
Gross Amount of Recognized Assets	$ 375	$ 116
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	375	116
Financial Instruments	(121)	(34)
Cash Collateral Received	0	0
Net Amount of Assets	254	82
Machinery, Energy & Transportation
Offsetting Assets
Gross Amount of Recognized Assets	74	32
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	74	32
Financial Instruments	(74)	(13)
Cash Collateral Received	0	0
Net Amount of Assets	0	19
Financial Products
Offsetting Assets
Gross Amount of Recognized Assets	301	84
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	301	84
Financial Instruments	(47)	(21)
Cash Collateral Received	0	0
Net Amount of Assets	$ 254	$ 63