Shareowners' Equity (Reclass Out Of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)	$ 82	$ 215
Financial Services Revenue	11,509	11,310
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	1,938	1,784
Interest Expense	2,400	3,185
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	(339)	412
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, before Tax	16	8
Other Comprehensive Income (Loss), Foreign Currency Translation Reclassification Adjustment Realized upon Sale or Liquidation, Tax	(33)	(5)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	(17)	3
Reclassification out of Accumulated Other Comprehensive Income [Member] | Available-for-sale Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	(216)	(32)
Income Tax Expense (Benefit)	94	6
Net Income (Loss) Available to Common Stockholders, Basic	(122)	(26)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Financial Services Revenue	(33)	648
Interest And Other Financial Charges	(12)	(31)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)	(42)	(35)
Net Income (Loss) Available to Common Stockholders, Basic	(189)	442
Interest Income (Expense), Net	(45)	617
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	(147)	477
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest Income (Expense), Net	(102)	(140)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)	3	3
Net Income (Loss) Available to Common Stockholders, Basic	(11)	(7)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	$ (14)	$ (10)