Finance Receivables - Credit Quality,Impaired Receivables, TDRs and Non-Accrual Status (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	$ 85,522	$ 81,993	$ 79,075
Number of Days Past Due After Which Consumer Receivables are Considered Impaired	greater than 120 days past due
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	31,951	31,796
Impaired Financing Receivable, Recorded Investment	136	71
Impaired Financing Receivable Recorded Investment, Percentage of Receivable	0.40%	0.20%
Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	30,755	30,371
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	53,571	50,197
Impaired Financing Receivable, Recorded Investment	421	435
Impaired Financing Receivable Recorded Investment, Percentage of Receivable	0.80%	0.90%
North America Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	64,395	62,836
North America Segment [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	22,369	23,189
North America Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	21,495	22,139
North America Segment [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	42,026	39,647
International Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	21,127	19,157
International Segment [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	9,582	8,607
International Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	9,260	8,232
International Segment [Member] | Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	11,545	10,550
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
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term, in days, for credit quality rating	current to 60 days past due
Special Mention [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Credit Quality Ratings Term Range	61 days
Special Mention [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Credit Quality Ratings Term Range	120 days
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term, in days, for credit quality rating	greater than 120 days past due
Group I | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	23,066	23,874
Group I | North America Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	18,260	18,424
Group I | International Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	4,806	5,450
Group II | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	6,024	5,381
Group II | North America Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	2,951	3,289
Group II | International Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	3,073	2,092
Group III | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,554	1,073
Group III | North America Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	256	424
Group III | International Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	1,298	649
Group IV | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	111	43
Group IV | North America Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	28	2
Group IV | International Segment [Member] | Commercial Portfolio Segment [Member] | Dealer Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivables	$ 83	$ 41