Shareowners' Equity (Reclass Out Of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)	$ 11	$ 104	$ 93	$ 319
Net Income (Loss) Available to Common Stockholders, Basic	1,666	1,569	3,484	3,144
Financial Services Revenue	10,949	11,328	22,458	22,638
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	1,939	2,136	3,877	3,920
Interest Expense	2,405	2,979	4,805	6,164
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	159	(394)	(180)	18
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, before Tax	1	0	17	8
Other Comprehensive Income (Loss), Foreign Currency Translation Reclassification Adjustment Realized upon Sale or Liquidation, Tax	112	0	79	(5)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	113	0	96	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	(16)	(13)	(232)	(45)
Income Tax Expense (Benefit)	13	4	107	10
Net Income (Loss) Available to Common Stockholders, Basic	(3)	(9)	(125)	(35)
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	170	(243)	137	405
Interest And Other Financial Charges	(6)	(22)	(18)	(53)
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)	(14)	13	(56)	(22)
Net Income (Loss) Available to Common Stockholders, Basic	58	(376)	(131)	66
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	72	(389)	(75)	88
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	(92)	(124)	(194)	(264)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Exchange Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Financial Services Revenue	164	(265)	119	352
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)	4	2	7	5
Net Income (Loss) Available to Common Stockholders, Basic	(9)	(9)	(20)	(16)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	$ (13)	$ (11)	$ (27)	$ (21)