Debt - Special Purpose Entity (Details) - USD ($)	Jun. 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	$ 3,000,000	$ 4,000,000
Finance receivables, net	1,057,000,000	1,082,000,000
Finance receivables due after one year, net	1,971,000,000	1,984,000,000
Equipment on operating leases, net	271,000,000	296,000,000
Total Assets	14,110,000,000	14,741,000,000
Current portion of long-term debt, net	642,000,000	394,000,000
Long-term debt	3,597,000,000	4,050,000,000
Total Liabilities	8,601,000,000	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	24,000,000	28,000,000
Finance receivables, net	301,000,000	350,000,000
Finance receivables due after one year, net	374,000,000	510,000,000
Equipment on operating leases, net	5,000,000	8,000,000
Restricted cash	34,000,000	22,000,000
Total Assets	738,000,000	918,000,000
Current portion of long-term debt, net	344,000,000	394,000,000
Long-term debt	213,000,000	370,000,000
Total Liabilities	557,000,000	$ 764,000,000
Debt issuance costs	$ 2,000,000