Finance Receivables Commercial Finance Receivables (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net Amount	$ 23,867		$ 10,998
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Acquisition Finance Receivables, Carrying Value			560
Business Combination, Acquired Receivables, Fair Value	3,990
Payments to Acquire Loans Receivable	16,199
Proceeds from Collection of Finance Receivables	(15,631)
Finance Receivables - Post Acquisition - Foreign Currency Translation	128
Loans and Leases Receivable, Net Amount	5,246
North America [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net Amount	12,232
North America [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Acquisition Finance Receivables, Carrying Value			560
Payments to Acquire Loans Receivable	3,919	584
Proceeds from Collection of Finance Receivables	(3,122)	(300)
Loans and Leases Receivable, Net Amount	1,357	284
International [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Net Amount	11,635
International [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business Combination, Acquired Receivables, Fair Value	3,990
Payments to Acquire Loans Receivable	12,280
Proceeds from Collection of Finance Receivables	(12,509)
Finance Receivables - Post Acquisition - Foreign Currency Translation	128
Loans and Leases Receivable, Net Amount	$ 3,889