Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Past Due Financing Receivable
Troubled debt restructurings of financing receivables	$ 0	$ 0
Total Lease Receivable and Loan Receivable Portfolio Segments
Past Due Financing Receivable
Fully reserved financing receivable	513	517
Less than 90 Days or Unbilled Financing Receivables	18,160	19,355
Total Financing Receivables	18,727	19,945
Recorded Investment > 90 Days and Accruing	364	388
Total Lease Receivable and Loan Receivable Portfolio Segments | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	54	73
Lease receivables
Past Due Financing Receivable
Fully reserved financing receivable	179	173
Less than 90 Days or Unbilled Financing Receivables	6,624	6,834
Total Financing Receivables	6,833	7,041
Recorded Investment > 90 Days and Accruing	179	168
Lease receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	30	35
Loan receivables
Past Due Financing Receivable
Fully reserved financing receivable	335	344
Less than 90 Days or Unbilled Financing Receivables	11,536	12,521
Total Financing Receivables	11,894	12,904
Recorded Investment > 90 Days and Accruing	185	220
Loan receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	24	38
Major Markets | Total Lease Receivable and Loan Receivable Portfolio Segments
Past Due Financing Receivable
Total Financing Receivables	14,433	15,256
Major Markets | Lease receivables
Past Due Financing Receivable
Fully reserved financing receivable	35	33
Less than 90 Days or Unbilled Financing Receivables	5,314	5,479
Total Financing Receivables	5,355	5,517
Recorded Investment > 90 Days and Accruing	106	108
Major Markets | Lease receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	7	5
Major Markets | Loan receivables
Past Due Financing Receivable
Fully reserved financing receivable	39	35
Less than 90 Days or Unbilled Financing Receivables	9,030	9,696
Total Financing Receivables	9,077	9,739
Recorded Investment > 90 Days and Accruing	130	134
Major Markets | Loan receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	9	7
Growth Markets | Total Lease Receivable and Loan Receivable Portfolio Segments
Past Due Financing Receivable
Total Financing Receivables	4,294	4,689
Growth Markets | Lease receivables
Past Due Financing Receivable
Fully reserved financing receivable	144	140
Less than 90 Days or Unbilled Financing Receivables	1,310	1,355
Total Financing Receivables	1,478	1,524
Recorded Investment > 90 Days and Accruing	73	60
Growth Markets | Lease receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	24	30
Growth Markets | Loan receivables
Past Due Financing Receivable
Fully reserved financing receivable	296	309
Less than 90 Days or Unbilled Financing Receivables	2,506	2,825
Total Financing Receivables	2,817	3,165
Recorded Investment > 90 Days and Accruing	55	86
Growth Markets | Loan receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	$ 15	$ 31