Accumulated Other Comprehensive Income (Loss) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Other income (expense)	$ (24)		$ (17)		$ (79)		$ 141
Interest expense of Financial Products	(178)		(197)		(552)		(599)
Tax (provision) benefit	(310)		(753)		(943)		(2,314)
Reclassifications net of tax	946	[1]	1,699	[1]	2,786	[1]	4,984	[1]
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications net of tax	(128)				(403)
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits
Amortization of actuarial gain (loss)	(196)				(589)
Amortization of prior service credit (cost)	14				41
Amortization of transition asset (obligation)	(1)				(2)
Reclassifications before tax	(183)				(550)
Tax (provision) benefit	63				188
Reclassifications net of tax	(120)				(362)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments
Reclassifications before tax	(14)				(66)
Tax (provision) benefit	5				24
Reclassifications net of tax	(9)				(42)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Foreign exchange contracts
Other income (expense)	(12)				(60)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Interest rate contracts | Machinery and Power Systems
Other income (expense)	(1)				(2)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Interest rate contracts | Financial Products
Interest expense of Financial Products	(1)				(4)
Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Other income (expense)	1				1
Tax (provision) benefit	0				0
Reclassifications net of tax	$ 1				$ 1

[1] 1 Profit attributable to common stockholders.