Commitments (Details 1) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Movement in standard warranty liability
Beginning Balance	$ 197	$ 376
Current period accruals	82	122
Accrual adjustments to reflect actual experience	9	8
Charges incurred	(100)	(172)
Ending Balance	188	$ 334
Extended lines of credit
Commitments, guarantees:
Unused amounts in lines of credit to third-party entities and commitments for future financing to clients	5,706		$ 5,365
Financing for client purchase agreements
Commitments, guarantees:
Unused amounts in lines of credit to third-party entities and commitments for future financing to clients	1,773		1,816
Financial guarantees
Commitments, guarantees:
Guarantor obligations, maximum exposure	$ 37		$ 46