Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Sep. 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	247	271
Less than 90 Days or Unbilled Financing Receivables	17,267	17,740
Total Financing Receivables	17,631	18,073
Recorded Investment > 90 Days and Accruing	746	253
Total Lease Receivable and Loan Receivable Portfolio Segments | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	117	62
Total Lease Receivable and Loan Receivable Portfolio Segments | Americas
Past Due Financing Receivable
Total Financing Receivables	9,721	10,015
Total Lease Receivable and Loan Receivable Portfolio Segments | EMEA
Past Due Financing Receivable
Total Financing Receivables	4,417	4,480
Total Lease Receivable and Loan Receivable Portfolio Segments | Asia Pacific
Past Due Financing Receivable
Total Financing Receivables	3,493	3,578
Lease receivables
Past Due Financing Receivable
Fully Reserved Financing Receivables	87	89
Less than 90 Days or Unbilled Financing Receivables	6,012	6,216
Total Financing Receivables	6,142	6,336
Recorded Investment > 90 Days and Accruing	290	111
Lease receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	42	31
Lease receivables | Americas
Past Due Financing Receivable
Fully Reserved Financing Receivables	51	20
Less than 90 Days or Unbilled Financing Receivables	3,463	3,793
Total Financing Receivables	3,541	3,830
Recorded Investment > 90 Days and Accruing	255	66
Lease receivables | Americas | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	28	17
Lease receivables | EMEA
Past Due Financing Receivable
Fully Reserved Financing Receivables	4	10
Less than 90 Days or Unbilled Financing Receivables	1,283	1,159
Total Financing Receivables	1,297	1,171
Recorded Investment > 90 Days and Accruing	15	6
Lease receivables | EMEA | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	9	2
Lease receivables | Asia Pacific
Past Due Financing Receivable
Fully Reserved Financing Receivables	32	59
Less than 90 Days or Unbilled Financing Receivables	1,266	1,264
Total Financing Receivables	1,304	1,335
Recorded Investment > 90 Days and Accruing	19	40
Lease receivables | Asia Pacific | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	5	12
Loan receivables
Past Due Financing Receivable
Fully Reserved Financing Receivables	160	182
Less than 90 Days or Unbilled Financing Receivables	11,255	11,524
Total Financing Receivables	11,489	11,737
Recorded Investment > 90 Days and Accruing	456	141
Loan receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	75	31
Loan receivables | Americas
Past Due Financing Receivable
Fully Reserved Financing Receivables	80	90
Less than 90 Days or Unbilled Financing Receivables	6,057	6,075
Total Financing Receivables	6,180	6,185
Recorded Investment > 90 Days and Accruing	401	80
Loan receivables | Americas | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	43	19
Loan receivables | EMEA
Past Due Financing Receivable
Fully Reserved Financing Receivables	19	5
Less than 90 Days or Unbilled Financing Receivables	3,076	3,299
Total Financing Receivables	3,120	3,309
Recorded Investment > 90 Days and Accruing	46	15
Loan receivables | EMEA | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	26	5
Loan receivables | Asia Pacific
Past Due Financing Receivable
Fully Reserved Financing Receivables	61	87
Less than 90 Days or Unbilled Financing Receivables	2,122	2,150
Total Financing Receivables	2,189	2,243
Recorded Investment > 90 Days and Accruing	9	46
Loan receivables | Asia Pacific | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	$ 6	$ 6