Financing Receivables: (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivables on Non-accrual Status
Total Receivables	$ 146	$ 139
Lease receivables
Financing Receivables on Non-accrual Status
Total Receivables	46	47
Lease receivables | Major Markets
Financing Receivables on Non-accrual Status
Total Receivables	26	27
Lease receivables | Growth Markets
Financing Receivables on Non-accrual Status
Total Receivables	20	21
Client loan receivables
Financing Receivables on Non-accrual Status
Total Receivables	100	92
Client loan receivables | Major Markets
Financing Receivables on Non-accrual Status
Total Receivables	41	67
Client loan receivables | Growth Markets
Financing Receivables on Non-accrual Status
Total Receivables	$ 59	$ 25