Consolidated Balance Sheet (Supplemental) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012
Statement of Financial Position [Abstract]
Variable Interest Entities Assets Liabilities	The following table presents the assets and liabilities of our consolidated variable interest entities. The assets of any variable interest entity can only be used to settle obligations of that respective variable interest entity, and the creditors (or beneficial interest holders) do not have recourse to us or our other assets. These assets and liabilities are included in the consolidated balance sheet above.
ASSETS
Finance receivables, net	$ 59,900	$ 58,042
Investments in operating leases, net	19,108	18,743
Total assets	91,694	88,913
LIABILITIES
Debt	75,232	73,234
Other liabilities	2,612	2,605
Total liabilities	83,546	81,251
Variable Interest Entity, Primary Beneficiary [Member]
ASSETS
Finance receivables, net	10,126	10,530
Investments in operating leases, net	662	0
Total assets	10,788	10,530
LIABILITIES
Debt	9,484	9,789
Other liabilities	2	2
Total liabilities	$ 9,486	$ 9,791