Financing Receivables - Past Due (Details) - USD ($) $ in Millions	Mar. 31, 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	300	271
Less than 90 Days or Unbilled Financing Receivables	16,794	17,740
Total Financing Receivables	17,179	18,073
Recorded Investment > 90 Days and Accruing	321	253
Total Lease Receivable and Loan Receivable Portfolio Segments | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	85	62
Total Lease Receivable and Loan Receivable Portfolio Segments | Americas
Past Due Financing Receivable
Total Financing Receivables	9,428	10,015
Total Lease Receivable and Loan Receivable Portfolio Segments | EMEA
Past Due Financing Receivable
Total Financing Receivables	4,216	4,480
Total Lease Receivable and Loan Receivable Portfolio Segments | Asia Pacific
Past Due Financing Receivable
Total Financing Receivables	3,535	3,578
Lease receivables
Past Due Financing Receivable
Fully Reserved Financing Receivables	100	89
Less than 90 Days or Unbilled Financing Receivables	5,961	6,216
Total Financing Receivables	6,098	6,336
Recorded Investment > 90 Days and Accruing	130	111
Lease receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	38	31
Lease receivables | Americas
Past Due Financing Receivable
Fully Reserved Financing Receivables	27	20
Less than 90 Days or Unbilled Financing Receivables	3,554	3,793
Total Financing Receivables	3,602	3,830
Recorded Investment > 90 Days and Accruing	102	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	8	10
Less than 90 Days or Unbilled Financing Receivables	1,140	1,159
Total Financing Receivables	1,154	1,171
Recorded Investment > 90 Days and Accruing	13	6
Lease receivables | EMEA | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	6	2
Lease receivables | Asia Pacific
Past Due Financing Receivable
Fully Reserved Financing Receivables	64	59
Less than 90 Days or Unbilled Financing Receivables	1,267	1,264
Total Financing Receivables	1,342	1,335
Recorded Investment > 90 Days and Accruing	16	40
Lease receivables | Asia Pacific | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	11	12
Loan receivables
Past Due Financing Receivable
Fully Reserved Financing Receivables	200	182
Less than 90 Days or Unbilled Financing Receivables	10,833	11,524
Total Financing Receivables	11,081	11,737
Recorded Investment > 90 Days and Accruing	191	141
Loan receivables | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	47	31
Loan receivables | Americas
Past Due Financing Receivable
Fully Reserved Financing Receivables	97	90
Less than 90 Days or Unbilled Financing Receivables	5,704	6,075
Total Financing Receivables	5,826	6,185
Recorded Investment > 90 Days and Accruing	141	80
Loan receivables | Americas | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	25	19
Loan receivables | EMEA
Past Due Financing Receivable
Fully Reserved Financing Receivables	10	5
Less than 90 Days or Unbilled Financing Receivables	3,037	3,299
Total Financing Receivables	3,062	3,309
Recorded Investment > 90 Days and Accruing	34	15
Loan receivables | EMEA | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	15	5
Loan receivables | Asia Pacific
Past Due Financing Receivable
Fully Reserved Financing Receivables	93	87
Less than 90 Days or Unbilled Financing Receivables	2,093	2,150
Total Financing Receivables	2,193	2,243
Recorded Investment > 90 Days and Accruing	16	46
Loan receivables | Asia Pacific | Total Past Due > 90 days
Past Due Financing Receivable
Total Past Due > 90 days	$ 8	$ 6