Financing Receivables - Credit Quality Indicators (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Lease receivables | Americas
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	$ 3,465	$ 3,776
Lease receivables | Americas | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	358	447
Lease receivables | Americas | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	715	782
Lease receivables | Americas | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	807	772
Lease receivables | Americas | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	762	822
Lease receivables | Americas | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	421	574
Lease receivables | Americas | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	345	297
Lease receivables | Americas | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	56	83
Lease receivables | EMEA
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,290	1,167
Lease receivables | EMEA | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	52	51
Lease receivables | EMEA | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	126	113
Lease receivables | EMEA | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	404	366
Lease receivables | EMEA | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	415	350
Lease receivables | EMEA | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	197	208
Lease receivables | EMEA | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	83	71
Lease receivables | EMEA | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	13	9
Lease receivables | Asia Pacific
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,269	1,259
Lease receivables | Asia Pacific | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	56	53
Lease receivables | Asia Pacific | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	543	486
Lease receivables | Asia Pacific | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	329	330
Lease receivables | Asia Pacific | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	172	185
Lease receivables | Asia Pacific | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	86	106
Lease receivables | Asia Pacific | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	69	84
Lease receivables | Asia Pacific | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	15	15
Loan receivables | Americas
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	6,059	6,016
Loan receivables | Americas | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	626	712
Loan receivables | Americas | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,251	1,246
Loan receivables | Americas | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,412	1,230
Loan receivables | Americas | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	1,333	1,309
Loan receivables | Americas | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	736	914
Loan receivables | Americas | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	604	472
Loan receivables | Americas | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	98	133
Loan receivables | EMEA
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	3,091	3,291
Loan receivables | EMEA | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	124	143
Loan receivables | EMEA | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	302	318
Loan receivables | EMEA | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	968	1,032
Loan receivables | EMEA | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	993	987
Loan receivables | EMEA | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	473	585
Loan receivables | EMEA | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	200	201
Loan receivables | EMEA | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	31	25
Loan receivables | Asia Pacific
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	2,124	2,154
Loan receivables | Asia Pacific | Aaa - Aa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	94	90
Loan receivables | Asia Pacific | A1 - A3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	908	832
Loan receivables | Asia Pacific | Baa1 - Baa3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	550	565
Loan receivables | Asia Pacific | Ba1 - Ba2
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	289	316
Loan receivables | Asia Pacific | Ba3 - B1
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	143	182
Loan receivables | Asia Pacific | B2 - B3
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	116	143
Loan receivables | Asia Pacific | Caa - D
Net recorded investment for each class of receivables, by credit quality indicator
Financing receivables, net recorded investment	$ 25	$ 25