Receivables - Summary of Aging of Receivables (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017		Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 18,957	$ 19,795	[1]	$ 18,890
Retail [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	93	54
Current	8,929	9,606
Total	9,076	9,725		9,617
Retail [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	9,022	9,660
Retail [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	54	65
Retail [Member] | NAFTA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	29	35
Current	6,330	6,671
Total	6,374	6,731
Retail [Member] | NAFTA [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	6,359	6,706
Retail [Member] | NAFTA [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	15	25
Retail [Member] | EMEA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13	11
Current	231	261
Total	264	272
Retail [Member] | EMEA [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	244	272
Retail [Member] | EMEA [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	20
Retail [Member] | LATAM [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	49	8
Current	1,652	1,851
Total	1,720	1,899
Retail [Member] | LATAM [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,701	1,859
Retail [Member] | LATAM [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	19	40
Retail [Member] | APAC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2
Current	716	823
Total	718	823
Retail [Member] | APAC [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	718	823
Retail [Member] | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	72	37
Retail [Member] | 30-59 Days Past Due | NAFTA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	21	26
Retail [Member] | 30-59 Days Past Due | EMEA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2	3
Retail [Member] | 30-59 Days Past Due | LATAM [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	48	8
Retail [Member] | 30-59 Days Past Due | APAC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1
Retail [Member] | 60-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	13
Retail [Member] | 60-90 Days Past Due | NAFTA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8	9
Retail [Member] | 60-90 Days Past Due | EMEA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2	4
Retail [Member] | 60-90 Days Past Due | LATAM [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1
Retail [Member] | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10	4
Retail [Member] | Greater Than 90 Days | EMEA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9	4
Retail [Member] | Greater Than 90 Days | APAC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1
Wholesale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	34	43
Current	9,745	9,908
Total	9,804	10,001		$ 9,208
Wholesale [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	9,779	9,951
Wholesale [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	25	50
Wholesale [Member] | NAFTA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,563	3,651
Total	3,588	3,692
Wholesale [Member] | NAFTA [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	3,563	3,651
Wholesale [Member] | NAFTA [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	25	41
Wholesale [Member] | EMEA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	31	39
Current	5,014	5,061
Total	5,045	5,109
Wholesale [Member] | EMEA [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	5,045	5,100
Wholesale [Member] | EMEA [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total		9
Wholesale [Member] | LATAM [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	513	613
Total	513	613
Wholesale [Member] | LATAM [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	513	613
Wholesale [Member] | APAC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3	4
Current	655	583
Total	658	587
Wholesale [Member] | APAC [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	658	587
Wholesale [Member] | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20	27
Wholesale [Member] | 30-59 Days Past Due | EMEA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	17	23
Wholesale [Member] | 30-59 Days Past Due | APAC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3	4
Wholesale [Member] | 60-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	12
Wholesale [Member] | 60-90 Days Past Due | EMEA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	12
Wholesale [Member] | Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3	4
Wholesale [Member] | Greater Than 90 Days | EMEA [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 3	$ 4

[1] 2017 figures have been recast following the retrospective adoption on January 1, 2018, of the updated accounting standard for revenue recognition (ASC 606).