Debt - Assets and Liabilities Held by SPE (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Billed portion of finance receivables, net	$ 100,000,000	$ 99,000,000
Finance receivables, net	1,039,000,000	1,082,000,000
Finance receivables due after one year, net	1,936,000,000	1,984,000,000
Equipment on operating leases, net	254,000,000	296,000,000
Total Assets	14,081,000,000	14,741,000,000
Current portion of long-term debt, net	646,000,000	394,000,000
Long-term debt	3,673,000,000	4,050,000,000
Total Liabilities	8,662,000,000	8,931,000,000
Special Purpose Entity (SPE)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Billed portion of finance receivables, net	15,000,000	28,000,000
Finance receivables, net	320,000,000	350,000,000
Finance receivables due after one year, net	428,000,000	510,000,000
Equipment on operating leases, net	9,000,000	8,000,000
Restricted cash	17,000,000	22,000,000
Total Assets	789,000,000	918,000,000
Current portion of long-term debt, net	346,000,000	394,000,000
Long-term debt	287,000,000	370,000,000
Total Liabilities	633,000,000	$ 764,000,000
Debt issuance costs	$ 2,000,000