Financing Receivables: (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivables on Non-accrual Status
Total Receivables	$ 159	$ 139
Lease receivables
Financing Receivables on Non-accrual Status
Total Receivables	55	47
Lease receivables | Major Markets
Financing Receivables on Non-accrual Status
Total Receivables	24	27
Lease receivables | Growth Markets
Financing Receivables on Non-accrual Status
Total Receivables	31	21
Loan receivables
Financing Receivables on Non-accrual Status
Total Receivables	104	92
Loan receivables | Major Markets
Financing Receivables on Non-accrual Status
Total Receivables	41	67
Loan receivables | Growth Markets
Financing Receivables on Non-accrual Status
Total Receivables	$ 62	$ 25