Finance Receivables Net (Details) (USD $)	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Wholesale Loans Percentage of Dealer Financing	95.00%
Net Finance Receivables [Abstract]
Finance receivables, net	$ 72,004,000,000		$ 71,510,000,000
Financial Services [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	76,939,000,000		76,159,000,000	72,707,000,000
Less: Allowance for Credit Losses	(355,000,000)	(369,000,000)	(389,000,000)	(384,000,000)	(452,000,000)	(501,000,000)
Finance receivables, net	76,584,000,000		75,770,000,000	72,323,000,000
Net finance receivables subject to fair value	74,997,000,000		73,618,000,000
Fair value	76,600,000,000		75,618,000,000
Finance Receivables Net Not Subject To Fair Value	1,600,000,000		2,200,000,000
Financial Services [Member] | North America [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	59,285,000,000		58,358,000,000
Less: Allowance for Credit Losses	(276,000,000)		(309,000,000)
Finance receivables, net	59,009,000,000		58,049,000,000
Financial Services [Member] | International [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	17,654,000,000		17,801,000,000
Less: Allowance for Credit Losses	(79,000,000)		(80,000,000)
Finance receivables, net	17,575,000,000		17,721,000,000
Financial Services [Member] | Consumer [Member]
Net Finance Receivables [Abstract]
Finance Receivable Before Unearned Interest Supplements	49,267,000,000		49,964,000,000
Less: Unearned interest supplements	(1,439,000,000)		(1,551,000,000)
Financing Receivable, Gross	47,828,000,000		48,413,000,000
Financial Services [Member] | Consumer [Member] | North America [Member]
Net Finance Receivables [Abstract]
Finance Receivable Before Unearned Interest Supplements	39,485,000,000		39,504,000,000
Less: Unearned interest supplements	(1,195,000,000)		(1,264,000,000)
Financing Receivable, Gross	38,290,000,000		38,240,000,000
Amount of finance receivables that secure certain debt obligations	21,400,000,000		23,000,000,000
Financial Services [Member] | Consumer [Member] | International [Member]
Net Finance Receivables [Abstract]
Finance Receivable Before Unearned Interest Supplements	9,782,000,000		10,460,000,000
Less: Unearned interest supplements	(244,000,000)		(287,000,000)
Financing Receivable, Gross	9,538,000,000		10,173,000,000
Amount of finance receivables that secure certain debt obligations	5,500,000,000		6,600,000,000
Financial Services [Member] | Non-consumer [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	29,111,000,000		27,746,000,000
Financial Services [Member] | Non-consumer [Member] | North America [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	20,995,000,000		20,118,000,000
Amount of finance receivables that secure certain debt obligations	16,900,000,000		17,100,000,000
Financial Services [Member] | Non-consumer [Member] | International [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	8,116,000,000		7,628,000,000
Amount of finance receivables that secure certain debt obligations	4,900,000,000		4,500,000,000
Financial Services [Member] | Non-consumer [Member] | Dealer Financing [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	27,872,000,000		26,671,000,000
Financial Services [Member] | Non-consumer [Member] | Dealer Financing [Member] | North America [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	20,152,000,000		19,429,000,000
Financial Services [Member] | Non-consumer [Member] | Dealer Financing [Member] | International [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	7,720,000,000		7,242,000,000
Financial Services [Member] | Non-consumer [Member] | Other [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	1,239,000,000		1,075,000,000
Financial Services [Member] | Non-consumer [Member] | Other [Member] | North America [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	843,000,000		689,000,000
Financial Services [Member] | Non-consumer [Member] | Other [Member] | International [Member]
Net Finance Receivables [Abstract]
Financing Receivable, Gross	396,000,000		386,000,000
Other Assets on Statement of Financial Position [Member] | Financial Services [Member]
Net Finance Receivables [Abstract]
Uncollected Interest Receivable Excluded From Finance Receivable	$ 186,000,000		$ 183,000,000