Accumulated Other Comprehensive Income (Loss) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Tax (provision) benefit	$ (246)		$ (689)
Reclassifications net of tax	880	[1]	1,586	[1]
Other income (expense)	29		88
Interest expense of Financial Products	(189)		(204)
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications net of tax	(131)
Reclassification out of Accumulated Other Comprehensive Income | Pension and other postretirement benefits
Amortization of actuarial gain (loss)	(196)
Amortization of prior service credit (cost)	14
Amortization of transition asset (obligation)	(1)
Reclassifications before tax	(183)
Tax (provision) benefit	62
Reclassifications net of tax	(121)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments
Reclassifications before tax	(18)
Tax (provision) benefit	7
Reclassifications net of tax	(11)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Foreign exchange contracts
Other income (expense)	(17)
Reclassification out of Accumulated Other Comprehensive Income | Derivative financial instruments | Interest rate contracts | Financial Products
Interest expense of Financial Products	(1)
Reclassification out of Accumulated Other Comprehensive Income | Available-for-sale securities
Tax (provision) benefit	0
Reclassifications net of tax	1
Other income (expense)	$ 1

[1] 1 Profit attributable to common stockholders.