Finance Receivables - Credit Quality,Impaired Receivables, TDRs and Non-Accrual Status (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	$ 79,075	$ 75,448	$ 71,907
Number of Days Past Due After Which Consumer Receivables are Considered Impaired	greater than 120 days past due
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term, in days, for credit quality rating	current to 60 days past due
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term, in days, for credit quality rating	greater than 120 days past due
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	29,754	28,466
Impaired Financing Receivable, Recorded Investment	58	47
Impaired Financing Receivable Recorded Investment, Percentage of Receivable	0.20%	0.20%
Financing Receivable, Recorded Investment, Nonaccrual Status	34	29
Financing Receivable, Recorded Investment, Nonaccrual Status, Percentage of Receivable	0.10%	0.10%
Finance Receivable, Modifications, Number of Contracts	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	5	5
Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	28,460	26,990
Commercial Portfolio Segment [Member] | Group I | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	22,445	21,413
Commercial Portfolio Segment [Member] | Group II | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	5,029	3,998
Commercial Portfolio Segment [Member] | Group III | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	952	1,554
Commercial Portfolio Segment [Member] | Group IV | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	34	25
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	49,321	46,982
Impaired Financing Receivable, Recorded Investment	424	422
Impaired Financing Receivable Recorded Investment, Percentage of Receivable	0.90%	0.90%
Financing Receivable, Recorded Investment, Nonaccrual Status	249	304
Financing Receivable, Recorded Investment, Nonaccrual Status, Percentage of Receivable	0.50%	0.60%
Financing Receivable, Modifications, Recorded Investment	171		185
Financing Receivable, Modifications, Recorded Investment, Percentage of Receivable	0.30%		0.40%
Financing Receivables, Modifications, Contracts Subsequently Defaulted, Default Rate	6.00%		5.70%
Financing Receivable, Allowance for Credit Losses Related to Troubled Debt Restructurings	22		18
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	15	13
North America Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	60,560	58,806
North America Segment [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	21,315	20,566
North America Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	20,395	19,494
North America Segment [Member] | Commercial Portfolio Segment [Member] | Group I | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	17,075	16,591
North America Segment [Member] | Commercial Portfolio Segment [Member] | Group II | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	2,970	2,608
North America Segment [Member] | Commercial Portfolio Segment [Member] | Group III | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	349	277
North America Segment [Member] | Commercial Portfolio Segment [Member] | Group IV | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	1	18
North America Segment [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	39,245	38,240
International Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	18,515	16,642
International Segment [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	8,439	7,900
International Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	8,065	7,496
International Segment [Member] | Commercial Portfolio Segment [Member] | Group I | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	5,370	4,822
International Segment [Member] | Commercial Portfolio Segment [Member] | Group II | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	2,059	1,390
International Segment [Member] | Commercial Portfolio Segment [Member] | Group III | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	603	1,277
International Segment [Member] | Commercial Portfolio Segment [Member] | Group IV | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	33	7
International Segment [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Gross	$ 10,076	$ 8,742
Minimum [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Credit Quality Ratings Term Range	61 days
Minimum [Member] | Consumer Portfolio Segment [Member] | Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Days At Which Finance Receivables Are Put in Non Accrual Status	120 days
Minimum [Member] | Consumer Portfolio Segment [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Days At Which Finance Receivables Are In Process Of Collection	90 days
Maximum [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Credit Quality Ratings Term Range	120 days