Finance Receivables, Net - Finance Receivables Aging Schedule (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	$ 3,440	$ 3,564
Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	115	107
Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	3,325	3,457
United States
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1,922	1,946
United States | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	89	80
United States | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1,833	1,866
Canada
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	320	335
Canada | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	10	10
Canada | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	310	325
Total Europe
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1,155	1,239
Total Europe | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	13	15
Total Europe | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1,142	1,224
France
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	367	418
France | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	3	5
France | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	364	413
UK Ireland
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	241	244
UK Ireland | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	2	2
UK Ireland | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	239	242
Central
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	298	327
Central | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	3	3
Central | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	295	324
Southern
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	205	205
Southern | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	5	5
Southern | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	200	200
Nordic
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	44	45
Nordic | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	0
Nordic | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	44	45
Other
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	43	44
Other | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	3	2
Other | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	40	42
Current | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	82	76
Current | United States | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	62	56
Current | Canada | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	8	7
Current | Total Europe | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	10	11
Current | France | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	3	5
Current | UK Ireland | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	2	2
Current | Central | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	2	1
Current | Southern | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	3	3
Current | Nordic | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	0
Current | Other | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	2	2
31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	19	19
31-90 Days Past Due | United States | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	16	15
31-90 Days Past Due | Canada | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1	2
31-90 Days Past Due | Total Europe | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1	2
31-90 Days Past Due | France | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	0
31-90 Days Past Due | UK Ireland | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	0
31-90 Days Past Due | Central | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	1
31-90 Days Past Due | Southern | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1	1
31-90 Days Past Due | Nordic | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	0
31-90 Days Past Due | Other | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1	0
90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	14	12
90 Days Past Due | United States | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	11	9
90 Days Past Due | Canada | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1	1
90 Days Past Due | Total Europe | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	2	2
90 Days Past Due | France | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	0
90 Days Past Due | UK Ireland | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	0
90 Days Past Due | Central | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1	1
90 Days Past Due | Southern | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1	1
90 Days Past Due | Nordic | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	0
90 Days Past Due | Other | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	0	0
90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	106	102
90 Days and Accruing | United States
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	57	54
90 Days and Accruing | Canada
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	17	22
90 Days and Accruing | Total Europe
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	32	26
90 Days and Accruing | France
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	15	14
90 Days and Accruing | UK Ireland
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
90 Days and Accruing | Central
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	13	6
90 Days and Accruing | Southern
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	4	6
90 Days and Accruing | Nordic
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
90 Days and Accruing | Other
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Direct
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1,103	1,237
Direct | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	56	56
Direct | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	1,047	1,181
Direct | Current | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	37	38
Direct | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	11	11
Direct | 90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	8	7
Direct | 90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	57	54
Indirect
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	819	709
Indirect | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	33	24
Indirect | Unbilled
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	786	685
Indirect | Current | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	25	18
Indirect | 31-90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	5	4
Indirect | 90 Days Past Due | Billed Revenues
Financing Receivable, Past Due [Line Items]
Financing receivables, before allowance for credit loss	3	2
Indirect | 90 Days and Accruing
Financing Receivable, Past Due [Line Items]
Financing Receivable, 90 Days or More Past Due, Still Accruing	$ 0	$ 0