Derivative Financial instruments and Risk Management-Effect of net settlement provisions upon default or termination- Offsetting assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Offsetting Assets
Gross Amount of Recognized Assets	$ 181	$ 131
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	181	131
Financial Instruments	(64)	(53)
Cash Collateral Received	0	0
Net Amount of Assets	117	78
Machinery, Energy & Transportation
Offsetting Assets
Gross Amount of Recognized Assets	28	19
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	28	19
Financial Instruments	(25)	(19)
Cash Collateral Received	0	0
Net Amount of Assets	3	0
Financial Products
Offsetting Assets
Gross Amount of Recognized Assets	153	112
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amount of Assets Presented in the Statement of Financial Position	153	112
Financial Instruments	(39)	(34)
Cash Collateral Received	0	0
Net Amount of Assets	$ 114	$ 78