Financing Receivables - Credit Quality Indicators (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Net recorded investment for each class of receivables, by credit quality indicator
Troubled debt restructurings of financing receivables
Lease receivables | Americas
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	3,568	3,774
Lease receivables | Americas | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	454	593
Lease receivables | Americas | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	804	678
Lease receivables | Americas | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	932	892
Lease receivables | Americas | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	679	852
Lease receivables | Americas | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	454	433
Lease receivables | Americas | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	198	299
Lease receivables | Americas | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	47	26
Lease receivables | EMEA
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,208	1,319
Lease receivables | EMEA | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	15	45
Lease receivables | EMEA | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	136	158
Lease receivables | EMEA | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	386	417
Lease receivables | EMEA | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	437	426
Lease receivables | EMEA | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	147	171
Lease receivables | EMEA | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	69	90
Lease receivables | EMEA | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	18	10
Lease receivables | Asia Pacific
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,109	1,128
Lease receivables | Asia Pacific | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	67	85
Lease receivables | Asia Pacific | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	540	413
Lease receivables | Asia Pacific | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	199	297
Lease receivables | Asia Pacific | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	135	191
Lease receivables | Asia Pacific | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	99	84
Lease receivables | Asia Pacific | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	54	50
Lease receivables | Asia Pacific | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	15	7
Loan receivables | Americas
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	6,097	6,712
Loan receivables | Americas | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	916	1,055
Loan receivables | Americas | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	892	1,206
Loan receivables | Americas | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,602	1,587
Loan receivables | Americas | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,459	1,516
Loan receivables | Americas | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	604	770
Loan receivables | Americas | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	521	531
Loan receivables | Americas | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	104	47
Loan receivables | EMEA
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	3,337	3,633
Loan receivables | EMEA | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	127	125
Loan receivables | EMEA | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	238	436
Loan receivables | EMEA | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,233	1,148
Loan receivables | EMEA | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	944	1,175
Loan receivables | EMEA | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	481	472
Loan receivables | EMEA | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	284	249
Loan receivables | EMEA | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	31	28
Loan receivables | Asia Pacific
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	2,358	2,457
Loan receivables | Asia Pacific | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	159	185
Loan receivables | Asia Pacific | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	792	901
Loan receivables | Asia Pacific | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	653	648
Loan receivables | Asia Pacific | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	535	417
Loan receivables | Asia Pacific | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	126	184
Loan receivables | Asia Pacific | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	75	109
Loan receivables | Asia Pacific | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	$ 19	$ 15