Financing Receivables: (Details 7) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Past Due Financing Receivable
Total Past Due (> 90 days)	$ 88	$ 62
Current	19,702	19,998
Total Financing Receivables	19,790	20,060
Recorded Investment > 90 Days and Accruing	59	38
Major Markets
Past Due Financing Receivable
Total Financing Receivables	14,771	15,587
Growth Markets
Past Due Financing Receivable
Total Financing Receivables	5,019	4,472
Lease receivables
Past Due Financing Receivable
Total Past Due (> 90 days)	27	16
Current	8,246	8,415
Total Financing Receivables	8,273	8,430
Recorded Investment > 90 Days and Accruing	19	12
Lease receivables | Major Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	11	6
Current	6,342	6,504
Total Financing Receivables	6,353	6,510
Recorded Investment > 90 Days and Accruing	8	6
Lease receivables | Growth Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	16	9
Current	1,904	1,911
Total Financing Receivables	1,920	1,921
Recorded Investment > 90 Days and Accruing	11	6
Client loan receivables
Past Due Financing Receivable
Total Past Due (> 90 days)	61	46
Current	11,456	11,584
Total Financing Receivables	11,518	11,629
Recorded Investment > 90 Days and Accruing	40	26
Client loan receivables | Major Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	28	23
Current	8,391	9,054
Total Financing Receivables	8,419	9,077
Recorded Investment > 90 Days and Accruing	10	7
Client loan receivables | Growth Markets
Past Due Financing Receivable
Total Past Due (> 90 days)	33	22
Current	3,065	2,530
Total Financing Receivables	3,099	2,552
Recorded Investment > 90 Days and Accruing	$ 30	$ 19