Commitments: (Details 1) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Extended lines of credit	Dec. 31, 2013 Extended lines of credit	Sep. 30, 2014 Financing for client purchase agreements	Dec. 31, 2013 Financing for client purchase agreements	Sep. 30, 2014 Financial guarantees	Dec. 31, 2013 Financial guarantees
Commitments, guarantees:
Unused amounts in lines of credit to third-party entities and commitments for future financing to clients			$ 5,521	$ 5,028	$ 1,567	$ 1,769
Guarantor obligations, maximum exposure							44	44
Movement in standard warranty liability
Beginning Balance	376	394
Current period accruals	186	238
Accrual adjustments to reflect actual experience	6	21
Charges incurred	(252)	(292)
Ending Balance	$ 316	$ 362