Financing Receivables, Receivables Purchased/Participated from IBM - Credit Quality Year of Origination (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Finance leases portfolio and loans receivable and participated loans
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	$ 16,997	$ 17,848
Finance leases portfolio and loans receivable and participated loans | Americas
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	9,626	10,049
Finance leases portfolio and loans receivable and participated loans | Americas | Aaa - Baa3
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
2020	1,406
2019	2,182
2018	1,136
2017	709
2016	289
2015 and prior	17
Amortized cost/Recorded investment	5,738
Finance leases portfolio and loans receivable and participated loans | Americas | Ba1 - D
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
2020	871
2019	1,587
2018	732
2017	382
2016	300
2015 and prior	17
Amortized cost/Recorded investment	3,888
Finance leases portfolio and loans receivable and participated loans | EMEA
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	4,534	4,796
Finance leases portfolio and loans receivable and participated loans | EMEA | Aaa - Baa3
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
2020	609
2019	919
2018	371
2017	140
2016	86
2015 and prior	40
Amortized cost/Recorded investment	2,164
Finance leases portfolio and loans receivable and participated loans | EMEA | Ba1 - D
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
2020	766
2019	988
2018	342
2017	183
2016	55
2015 and prior	35
Amortized cost/Recorded investment	2,370
Finance leases portfolio and loans receivable and participated loans | Asia Pacific
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	2,836	3,003
Finance leases portfolio and loans receivable and participated loans | Asia Pacific | Aaa - Baa3
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
2020	228
2019	1,485
2018	193
2017	61
2016	34
2015 and prior	19
Amortized cost/Recorded investment	2,020
Finance leases portfolio and loans receivable and participated loans | Asia Pacific | Ba1 - D
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
2020	134
2019	585
2018	50
2017	30
2016	11
2015 and prior	7
Amortized cost/Recorded investment	817
Lease receivables
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	4,314	4,274
Lease receivables | Americas
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	3,338	3,160
Lease receivables | EMEA
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	601	710
Lease receivables | Asia Pacific
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	376	404
Loan receivables
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	8,476	9,264
Loan receivables | Americas
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	5,657	6,173
Loan receivables | EMEA
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	2,219	2,415
Loan receivables | Asia Pacific
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	600	676
Long-term participated receivables from IBM
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	4,206	4,310
Long-term participated receivables from IBM | Americas
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	631	717
Long-term participated receivables from IBM | EMEA
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	1,715	1,671
Long-term participated receivables from IBM | Asia Pacific
Amortized cost/recorded investment for each class of receivables, by credit quality indicator
Amortized cost/Recorded investment	$ 1,860	$ 1,922