Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Sep. 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	17,454	19,355
Total Financing Receivables	18,025	19,945
Recorded Investment > 90 Days and Accruing	399	388
Total Lease Receivable and Loan Receivable Portfolio Segments | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	58	73
Lease receivables
Past Due Financing Receivable
Fully reserved financing receivable	171	173
Less than 90 Days or Unbilled Financing Receivables	6,603	6,834
Total Financing Receivables	6,806	7,041
Recorded Investment > 90 Days and Accruing	188	168
Lease receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	32	35
Loan receivables
Past Due Financing Receivable
Fully reserved financing receivable	342	344
Less than 90 Days or Unbilled Financing Receivables	10,851	12,521
Total Financing Receivables	11,219	12,904
Recorded Investment > 90 Days and Accruing	210	220
Loan receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	26	38
Major Markets | Total Lease Receivable and Loan Receivable Portfolio Segments
Past Due Financing Receivable
Total Financing Receivables	13,858	15,256
Major Markets | Lease receivables
Past Due Financing Receivable
Fully reserved financing receivable	19	33
Less than 90 Days or Unbilled Financing Receivables	5,154	5,479
Total Financing Receivables	5,180	5,517
Recorded Investment > 90 Days and Accruing	133	108
Major Markets | Lease receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	8	5
Major Markets | Loan receivables
Past Due Financing Receivable
Fully reserved financing receivable	40	35
Less than 90 Days or Unbilled Financing Receivables	8,628	9,696
Total Financing Receivables	8,678	9,739
Recorded Investment > 90 Days and Accruing	162	134
Major Markets | Loan receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	10	7
Growth Markets | Total Lease Receivable and Loan Receivable Portfolio Segments
Past Due Financing Receivable
Total Financing Receivables	4,167	4,689
Growth Markets | Lease receivables
Past Due Financing Receivable
Fully reserved financing receivable	152	140
Less than 90 Days or Unbilled Financing Receivables	1,449	1,355
Total Financing Receivables	1,626	1,524
Recorded Investment > 90 Days and Accruing	55	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	302	309
Less than 90 Days or Unbilled Financing Receivables	2,223	2,825
Total Financing Receivables	2,541	3,165
Recorded Investment > 90 Days and Accruing	49	86
Growth Markets | Loan receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	$ 16	$ 31