Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Past Due Financing Receivable
Troubled debt restructurings of financing receivables
Total Lease Receivable and Loan Receivable Portfolio Segments
Past Due Financing Receivable
Fully Reserved Financing Receivables	235	271
Less than 90 Days or Unbilled Financing Receivables	17,077	17,740
Total Financing Receivables	17,401	18,073
Recorded Investment > 90 Days and Accruing	320	253
Total Lease Receivable and Loan Receivable Portfolio Segments | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	89	62
Total Lease Receivable and Loan Receivable Portfolio Segments | Americas
Past Due Financing Receivable
Total Financing Receivables	9,456	10,015
Total Lease Receivable and Loan Receivable Portfolio Segments | EMEA
Past Due Financing Receivable
Total Financing Receivables	4,303	4,480
Total Lease Receivable and Loan Receivable Portfolio Segments | Asia Pacific
Past Due Financing Receivable
Total Financing Receivables	3,642	3,578
Lease receivables
Past Due Financing Receivable
Fully Reserved Financing Receivables	68	89
Less than 90 Days or Unbilled Financing Receivables	5,844	6,216
Total Financing Receivables	5,946	6,336
Recorded Investment > 90 Days and Accruing	136	111
Lease receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	35	31
Lease receivables | Americas
Past Due Financing Receivable
Fully Reserved Financing Receivables	19	20
Less than 90 Days or Unbilled Financing Receivables	3,402	3,793
Total Financing Receivables	3,442	3,830
Recorded Investment > 90 Days and Accruing	112	66
Lease receivables | Americas | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	21	17
Lease receivables | EMEA
Past Due Financing Receivable
Fully Reserved Financing Receivables	9	10
Less than 90 Days or Unbilled Financing Receivables	1,186	1,159
Total Financing Receivables	1,202	1,171
Recorded Investment > 90 Days and Accruing	12	6
Lease receivables | EMEA | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	7	2
Lease receivables | Asia Pacific
Past Due Financing Receivable
Fully Reserved Financing Receivables	40	59
Less than 90 Days or Unbilled Financing Receivables	1,255	1,264
Total Financing Receivables	1,302	1,335
Recorded Investment > 90 Days and Accruing	12	40
Lease receivables | Asia Pacific | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	7	12
Loan receivables
Past Due Financing Receivable
Fully Reserved Financing Receivables	167	182
Less than 90 Days or Unbilled Financing Receivables	11,233	11,524
Total Financing Receivables	11,455	11,737
Recorded Investment > 90 Days and Accruing	184	141
Loan receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	55	31
Loan receivables | Americas
Past Due Financing Receivable
Fully Reserved Financing Receivables	96	90
Less than 90 Days or Unbilled Financing Receivables	5,886	6,075
Total Financing Receivables	6,014	6,185
Recorded Investment > 90 Days and Accruing	145	80
Loan receivables | Americas | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	31	19
Loan receivables | EMEA
Past Due Financing Receivable
Fully Reserved Financing Receivables	16	5
Less than 90 Days or Unbilled Financing Receivables	3,068	3,299
Total Financing Receivables	3,101	3,309
Recorded Investment > 90 Days and Accruing	30	15
Loan receivables | EMEA | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	17	5
Loan receivables | Asia Pacific
Past Due Financing Receivable
Fully Reserved Financing Receivables	55	87
Less than 90 Days or Unbilled Financing Receivables	2,279	2,150
Total Financing Receivables	2,340	2,243
Recorded Investment > 90 Days and Accruing	10	46
Loan receivables | Asia Pacific | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	$ 6	$ 6