Variable Interest Entities - VIEs of Which we are the Primary Beneficiary (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Assets and liabilities [Abstract]
Cash and cash equivalents	$ 15,101,000,000	$ 17,472,000,000	$ 15,101,000,000	$ 17,472,000,000	$ 17,148,000,000	$ 14,805,000,000
Debt	99,897,000,000		99,897,000,000		99,488,000,000
Derivative Instruments related exposure [Abstract]
Fair Value of Assets	1,500,000,000		1,500,000,000
Financial Performance [Abstract]
Interest expense	986,000,000	1,127,000,000	1,997,000,000	2,301,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Assets and liabilities [Abstract]
Cash and cash equivalents	3,273,000,000		3,273,000,000		3,402,000,000
Debt	36,996,000,000		36,996,000,000		41,421,000,000
Financial Services [Member]
Assets and liabilities [Abstract]
Cash and cash equivalents	7,921,000,000	7,650,000,000	7,921,000,000	7,650,000,000	9,183,000,000	8,504,000,000
Debt	85,707,000,000		85,707,000,000		86,595,000,000
Derivative Instruments related exposure [Abstract]
Fair Value of Assets	1,336,000,000		1,336,000,000		1,375,000,000
Fair Value of Liabilities	299,000,000		299,000,000		299,000,000
Financial Performance [Abstract]
Interest expense	798,000,000	925,000,000	1,624,000,000	1,848,000,000
Financial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash contribution for collateral to support Wholesale Securitization Program	130,000,000		130,000,000		0
Assets and liabilities [Abstract]
Cash and cash equivalents	3,300,000,000		3,300,000,000		3,400,000,000
Finance Receivables Net And Net Investment In Operating Leases	50,100,000,000		50,100,000,000		56,200,000,000
Debt	37,000,000,000		37,000,000,000		41,400,000,000
Footnote information [Abstract]
Variable Interest Entities Liabilities Excluded	127,000,000		127,000,000		246,000,000
Financial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Finance Receivables [Member]
Assets and liabilities [Abstract]
Cash and cash equivalents	3,000,000,000		3,000,000,000		3,000,000,000
Finance Receivables Net And Net Investment In Operating Leases	45,900,000,000		45,900,000,000		49,800,000,000
Debt	34,100,000,000		34,100,000,000		37,200,000,000
Financial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Retail [Member]
Assets and liabilities [Abstract]
Cash and cash equivalents	2,400,000,000		2,400,000,000		2,500,000,000
Finance Receivables Net And Net Investment In Operating Leases	27,900,000,000		27,900,000,000		31,900,000,000
Debt	22,500,000,000		22,500,000,000		26,000,000,000
Financial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Wholesale [Member]
Assets and liabilities [Abstract]
Cash and cash equivalents	600,000,000		600,000,000		500,000,000
Finance Receivables Net And Net Investment In Operating Leases	18,000,000,000		18,000,000,000		17,900,000,000
Debt	11,600,000,000		11,600,000,000		11,200,000,000
Financial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Net Investment in Operating Leases [Member]
Assets and liabilities [Abstract]
Cash and cash equivalents	300,000,000		300,000,000		400,000,000
Finance Receivables Net And Net Investment In Operating Leases	4,200,000,000		4,200,000,000		6,400,000,000
Debt	2,900,000,000		2,900,000,000		4,200,000,000
Minimum [Member] | Financial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash contribution for collateral to support Wholesale Securitization Program	0		0
Maximum [Member] | Financial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash contribution for collateral to support Wholesale Securitization Program	130,000,000		130,000,000
Securitization Transactions [Member] | Financial Services [Member]
Derivative Instruments related exposure [Abstract]
Fair Value of Assets	99,000,000		99,000,000		238,000,000
Fair Value of Liabilities	172,000,000		172,000,000		160,000,000
Financial Performance [Abstract]
Derivative expense/(income)	29,000,000	61,000,000	136,000,000	71,000,000
Securitization Transactions [Member] | Financial Services [Member] | Related to Variable Interest Entity Not VIE [Member]
Derivative Instruments related exposure [Abstract]
Fair Value of Assets	89,000,000		89,000,000		81,000,000
Fair Value of Liabilities	64,000,000		64,000,000		63,000,000
Financial Performance [Abstract]
Derivative expense/(income)	(27,000,000)	(27,000,000)	(15,000,000)	38,000,000
Securitization Transactions [Member] | Financial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial Performance [Abstract]
Interest expense	201,000,000	261,000,000	428,000,000	515,000,000
Securitization Transactions [Member] | Financial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Variable Interest Entity, Securitization Entities [Member]
Derivative Instruments related exposure [Abstract]
Fair Value of Assets	10,000,000		10,000,000		157,000,000
Fair Value of Liabilities	108,000,000		108,000,000		97,000,000
Financial Performance [Abstract]
Derivative expense/(income)	$ 56,000,000	$ 88,000,000	$ 151,000,000	$ 33,000,000