Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)		$ (68)	$ 117	$ 76	$ 236
Interest expense excluding Financial Products		(127)	(128)	(381)	(358)
Interest expense of Financial Products		(142)	(157)	(440)	(470)
Tax (provision) benefit		(144)	(364)	(870)	(1,201)
Reclassifications net of tax	[1]	368	1,017	2,189	2,938
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Reclassifications net of tax		(102)	(67)	(348)	(207)
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Amortization of actuarial gain (loss)		(164)	(130)	(494)	(390)
Amortization of prior service credit (cost)		13	9	40	28
Reclassifications before tax		(151)	(121)	(454)	(362)
Tax (provision) benefit		51	41	154	122
Reclassifications net of tax		(100)	(80)	(300)	(240)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Reclassifications before tax		(31)	1	(109)	17
Tax (provision) benefit		11	(1)	40	(7)
Reclassifications net of tax		(20)	0	(69)	10
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)		(29)	4	(101)	24
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)	(4)	(3)
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 of Financial Products		(1)	(2)	(4)	(4)
Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Other income (expense)		27	20	31	34
Tax (provision) benefit		(9)	(7)	(10)	(11)
Reclassifications net of tax		$ 18	$ 13	$ 21	$ 23

[1] 1 Profit attributable to common stockholders.