Commitments (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Extended lines of credit	Dec. 31, 2010 Extended lines of credit	Sep. 30, 2011 Financing for client purchase agreements	Dec. 31, 2010 Financing for client purchase agreements	Sep. 30, 2011 Financial guarantees	Dec. 31, 2010 Financial guarantees
Commitments, guarantees:
Unused amounts in lines of credit to third-party entities and commitments for future financing to clients			$ 3,815	$ 3,415	$ 2,767	$ 2,825
Guarantor obligations, maximum exposure							52	48
Movement in standard warranty liability
Beginning Balance	375	316
Current period accruals	309	284
Accrual adjustments to reflect actual experience	15	31
Charges incurred	(318)	(326)
Ending Balance	$ 382	$ 305