Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)	$ 222	$ 160
Reclassifications before tax	1,513	2,264
Tax (provision) benefit	(425)	(387)
Reclassifications net of tax	1,092	1,881
Sales of Machinery, Energy & Transportation	10,635	13,466
Cost of goods sold	7,266	9,003
Interest expense of Financial Products	175	190
Interest Expense Excluding Financial Products	113	103
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Reclassifications net of tax	38	15
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)	(24)	0
Reclassifications net of tax	(24)	0
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Tax (provision) benefit	(2)	(3)
Reclassifications net of tax	7	7
Amortization of prior service credit (cost)	9	10
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Reclassifications before tax	70	11
Tax (provision) benefit	(15)	(2)
Reclassifications net of tax	55	9
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Foreign exchange contracts | Financial Products Segment
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)	71	6
Interest expense of Financial Products	11	7
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Foreign exchange contracts | Machinery, Energy & Transportation
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Sales of Machinery, Energy & Transportation	5	1
Cost of goods sold	(11)	(3)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Interest rate contracts | Financial Products Segment
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Interest expense of Financial Products	(5)	1
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Interest rate contracts | Machinery, Energy & Transportation
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Interest Expense Excluding Financial Products	(1)	(1)
Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)	0	(1)
Reclassifications net of tax	$ 0	$ (1)