Parent And Guarantor Consolidating Financial Statements (Schedule Of Condensed Consolidating Statement of Cash Flow) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 4,940		$ 4,363
Purchases of available-for-sale securities	(6,758)		(10,982)
Proceeds from sales of available-for-sale securities	5,636		8,423
Proceeds from maturities of available-for-sale securities	2,792		2,386
Net (increase) decrease in finance receivables and loans	(7,475)		(8,669)
Proceeds from sales of finance receivables and loans	1,978		1,346
Net (increase) decrease in operating lease assets	(2,458)		(196)
Capital contributions to subsidiaries	0		0
Returns of contributed capital	0		0
Net decrease in cash and cash equivalents from deconsolidation of ResCap	(539)		0
Proceeds from sale of business units, net	516	[1]	47	[1]
Other, net	165		871
Net cash (used in) provided by investing activities	(6,143)		(6,774)
Net change in short-term borrowings	(1,485)		(227)
Net increase in bank deposits	2,895		2,570
Proceeds from issuance of long-term debt	19,123		26,225
Repayments of long-term debt	(15,916)		(22,951)
Dividends paid	(401)		(419)
Capital contributions from parent	0		0
Other, net	78		551
Net cash provided by (used in) financing activities	4,294		5,749
Effect of exchange-rate changes on cash and cash equivalents	(39)		(78)
Net increase (decrease) in cash and cash equivalents	3,052		3,260
Adjustment for change in cash and cash equivalents of operations held-for-sale	39		(29)
Cash and cash equivalents at beginning of period	13,035		11,670
Cash and cash equivalents at end of period	16,126		14,901
Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	0		0
Net change in debt	0		0
Dividends paid and returns of contributed capital	0		0
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(453)		4,533
Purchases of available-for-sale securities	0		0
Proceeds from sales of available-for-sale securities	0		1,494
Proceeds from maturities of available-for-sale securities	0		1
Net (increase) decrease in finance receivables and loans	(1,986)		(7,165)
Proceeds from sales of finance receivables and loans	0		1,346
Net (increase) decrease in operating lease assets	417		(1,004)
Capital contributions to subsidiaries	(51)		(1,091)
Returns of contributed capital	1,666		4,037
Net decrease in cash and cash equivalents from deconsolidation of ResCap	0
Proceeds from sale of business units, net	29		0
Other, net	(43)		(185)
Net cash (used in) provided by investing activities	2,773		511
Net change in short-term borrowings	202		(73)
Net increase in bank deposits	0		0
Proceeds from issuance of long-term debt	2,542		2,549
Repayments of long-term debt	(1,491)		(4,598)
Dividends paid	(401)		(419)
Capital contributions from parent	0		0
Other, net	(245)		254
Net cash provided by (used in) financing activities	1,073		(2,486)
Effect of exchange-rate changes on cash and cash equivalents	(117)		0
Net increase (decrease) in cash and cash equivalents	3,276		2,558
Adjustment for change in cash and cash equivalents of operations held-for-sale	0		0
Cash and cash equivalents at beginning of period	6,261		4,665
Cash and cash equivalents at end of period	9,537		7,223
Parent [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	2,741		3,078
Net change in debt	466		(199)
Dividends paid and returns of contributed capital	0		0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	19		218
Purchases of available-for-sale securities	0		0
Proceeds from sales of available-for-sale securities	0		0
Proceeds from maturities of available-for-sale securities	0		0
Net (increase) decrease in finance receivables and loans	86		4
Proceeds from sales of finance receivables and loans	0		0
Net (increase) decrease in operating lease assets	0		0
Capital contributions to subsidiaries	0		(500)
Returns of contributed capital	0		0
Net decrease in cash and cash equivalents from deconsolidation of ResCap	0
Proceeds from sale of business units, net	0		0
Other, net	0		0
Net cash (used in) provided by investing activities	318		(526)
Net change in short-term borrowings	8		6
Net increase in bank deposits	0		0
Proceeds from issuance of long-term debt	0		45
Repayments of long-term debt	(27)		(43)
Dividends paid	0		0
Capital contributions from parent	0		500
Other, net	0		0
Net cash provided by (used in) financing activities	(341)		325
Effect of exchange-rate changes on cash and cash equivalents	0		0
Net increase (decrease) in cash and cash equivalents	(4)		17
Adjustment for change in cash and cash equivalents of operations held-for-sale	0		0
Cash and cash equivalents at beginning of period	14		1
Cash and cash equivalents at end of period	10		18
Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	232		(30)
Net change in debt	(311)		24
Dividends paid and returns of contributed capital	(11)		(207)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	5,699		124
Purchases of available-for-sale securities	(6,758)		(10,982)
Proceeds from sales of available-for-sale securities	5,636		6,929
Proceeds from maturities of available-for-sale securities	2,792		2,385
Net (increase) decrease in finance receivables and loans	(5,575)		(1,508)
Proceeds from sales of finance receivables and loans	1,978		0
Net (increase) decrease in operating lease assets	(2,875)		808
Capital contributions to subsidiaries	0		0
Returns of contributed capital	0		0
Net decrease in cash and cash equivalents from deconsolidation of ResCap	(539)
Proceeds from sale of business units, net	487		47
Other, net	208		1,056
Net cash (used in) provided by investing activities	(4,323)		(1,289)
Net change in short-term borrowings	(1,695)		(160)
Net increase in bank deposits	2,895		2,570
Proceeds from issuance of long-term debt	16,581		23,631
Repayments of long-term debt	(14,398)		(18,310)
Dividends paid	0		0
Capital contributions from parent	51		1,091
Other, net	323		297
Net cash provided by (used in) financing activities	(1,195)		1,729
Effect of exchange-rate changes on cash and cash equivalents	78		(78)
Net increase (decrease) in cash and cash equivalents	259		486
Adjustment for change in cash and cash equivalents of operations held-for-sale	39		(29)
Cash and cash equivalents at beginning of period	7,276		7,508
Cash and cash equivalents at end of period	7,574		7,965
Non-Guarantor Subsidiaries [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	323		(24)
Net change in debt	(2,972)		(3,048)
Dividends paid and returns of contributed capital	(1,980)		(4,342)
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(325)		(512)
Purchases of available-for-sale securities	0		0
Proceeds from sales of available-for-sale securities	0		0
Proceeds from maturities of available-for-sale securities	0		0
Net (increase) decrease in finance receivables and loans	0		0
Proceeds from sales of finance receivables and loans	0		0
Net (increase) decrease in operating lease assets	0		0
Capital contributions to subsidiaries	51		1,591
Returns of contributed capital	(1,666)		(4,037)
Net decrease in cash and cash equivalents from deconsolidation of ResCap	0
Proceeds from sale of business units, net	0		0
Other, net	0		0
Net cash (used in) provided by investing activities	(4,911)		(5,470)
Net change in short-term borrowings	0		0
Net increase in bank deposits	0		0
Proceeds from issuance of long-term debt	0		0
Repayments of long-term debt	0		0
Dividends paid	0		0
Capital contributions from parent	(51)		(1,591)
Other, net	0		0
Net cash provided by (used in) financing activities	4,757		6,181
Effect of exchange-rate changes on cash and cash equivalents	0		0
Net increase (decrease) in cash and cash equivalents	(479)		199
Adjustment for change in cash and cash equivalents of operations held-for-sale	0		0
Cash and cash equivalents at beginning of period	(516)		(504)
Cash and cash equivalents at end of period	(995)		(305)
Consolidation, Eliminations [Member] | Intercompany [Member]
Condensed Financial Statements, Captions [Line Items]
Net (increase) decrease in finance receivables and loans	(3,296)		(3,024)
Net change in debt	2,817		3,223
Dividends paid and returns of contributed capital	$ 1,991		$ 4,549

[1] The amounts are net of cash and cash equivalents of $147 million at June 30, 2012, and $88 million at June 30, 2011, of business units at the time of disposition.