Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)	$ 14		$ 88		$ 265		$ 316
Reclassifications before tax	863		2,005		3,054		6,447
Tax (provision) benefit	(187)		(518)		(839)		(1,470)
Reclassifications net of tax	668	[1]	1,494	[1]	2,218	[2]	4,995	[2]
Sales of Machinery, Energy & Transportation	9,881		12,758		30,513		40,656
Cost of goods sold	6,919		8,569		21,298		27,513
Financial Products
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Sales of Machinery, Energy & Transportation	653		784		2,061		2,287
Interest Expense	137		189		461		571
Machinery, Energy & Transportation
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Sales of Machinery, Energy & Transportation	9,228		11,974		28,452		38,369
All other excluding Financial Products
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Interest Expense	136		103		384		309
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Reclassifications net of tax	(66)		84		(77)		108
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)					(22)		0
Reclassifications net of tax					(22)		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)		(2)		(7)		(8)
Reclassifications net of tax	7		8		21		22
Amortization of prior service credit (cost)	9		10		28		30
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Reclassifications before tax	(93)		96		(98)		109
Tax (provision) benefit	20		(20)		22		(23)
Reclassifications net of tax	(73)		76		(76)		86
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Foreign exchange contracts | Financial Products
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)	(63)		89		(35)		91
Interest Expense	8		9		28		23
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	(6)		3		10		4
Cost of goods sold	(15)		0		(58)		(4)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Interest rate contracts | Financial Products
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Interest Expense	(16)		(3)		(40)		(2)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Interest rate contracts | All other excluding Financial Products
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Interest Expense	$ (1)		$ (2)		$ (3)		$ (3)

[1] Profit attributable to common shareholders.

[2] Profit attributable to common shareholders.