Finance Receivables, Net - Aging of Billed Finance Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Subtotal	$ 3,218	$ 3,440
Finance receivables, greater than 90 days and accruing	135	106
Billed Revenues
Financing Receivable, Past Due [Line Items]
Current finance receivables	77	82
Subtotal	115	115
Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Subtotal	3,103	3,325
31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	20	19
>90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	18	14
United States (Direct):
Financing Receivable, Past Due [Line Items]
Subtotal	980	1,103
Finance receivables, greater than 90 days and accruing	79	57
United States (Direct): | Billed Revenues
Financing Receivable, Past Due [Line Items]
Current finance receivables	35	37
Subtotal	55	56
United States (Direct): | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Subtotal	925	1,047
United States (Direct): | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	9	11
United States (Direct): | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	11	8
United States (Indirect):
Financing Receivable, Past Due [Line Items]
Subtotal	839	819
Finance receivables, greater than 90 days and accruing	0	0
United States (Indirect): | Billed Revenues
Financing Receivable, Past Due [Line Items]
Current finance receivables	23	25
Subtotal	32	33
United States (Indirect): | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Subtotal	807	786
United States (Indirect): | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	6	5
United States (Indirect): | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	3	3
United States
Financing Receivable, Past Due [Line Items]
Subtotal	1,819	1,922
Finance receivables, greater than 90 days and accruing	79	57
United States | Billed Revenues
Financing Receivable, Past Due [Line Items]
Current finance receivables	58	62
Subtotal	87	89
United States | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Subtotal	1,732	1,833
United States | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	15	16
United States | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	14	11
Canada
Financing Receivable, Past Due [Line Items]
Subtotal	284	326
Finance receivables, greater than 90 days and accruing	19	17
Canada | Billed Revenues
Financing Receivable, Past Due [Line Items]
Current finance receivables	7	8
Subtotal	10	11
Canada | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Subtotal	274	315
Canada | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	2	2
Canada | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	1	1
Europe
Financing Receivable, Past Due [Line Items]
Subtotal	1,115	1,192
Finance receivables, greater than 90 days and accruing	37	32
Europe | Billed Revenues
Financing Receivable, Past Due [Line Items]
Current finance receivables	12	12
Subtotal	18	15
Europe | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Subtotal	1,097	1,177
Europe | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	3	1
Europe | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Past due finance receivables	$ 3	$ 2