Finance Receivables, Net - Aging of Billed Finance Receivables (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	$ 3,213	$ 3,440
Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	121	115
Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	3,092	3,325
Current | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	81	82
31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	22	19
>90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	18	14
>90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Finance receivables, greater than 90 days and accruing	137	106
United States (Direct):
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	1,001	1,103
United States (Direct): | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	56	56
United States (Direct): | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	945	1,047
United States (Direct): | Current | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	36	37
United States (Direct): | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	9	11
United States (Direct): | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	11	8
United States (Direct): | >90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Finance receivables, greater than 90 days and accruing	84	57
United States (Indirect):
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	823	819
United States (Indirect): | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	33	33
United States (Indirect): | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	790	786
United States (Indirect): | Current | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	24	25
United States (Indirect): | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	6	5
United States (Indirect): | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	3	3
United States (Indirect): | >90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Finance receivables, greater than 90 days and accruing	0	0
United States
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	1,824	1,922
United States | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	89	89
United States | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	1,735	1,833
United States | Current | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	60	62
United States | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	15	16
United States | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	14	11
United States | >90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Finance receivables, greater than 90 days and accruing	84	57
Canada
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	289	326
Canada | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	11	11
Canada | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	278	315
Canada | Current | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	7	8
Canada | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	3	2
Canada | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	1	1
Canada | >90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Finance receivables, greater than 90 days and accruing	19	17
Europe
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	1,100	1,192
Europe | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	21	15
Europe | Unbilled Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	1,079	1,177
Europe | Current | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	14	12
Europe | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	4	1
Europe | >90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Total Finance Receivables	3	2
Europe | >90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Finance receivables, greater than 90 days and accruing	$ 34	$ 32