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Receivables - Investment in Impaired Receivables (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Retail [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total $ 231 $ 212
Recorded Investment, Total 338 347
Unpaid Principal Balance, Total 336 345
Average recorded investment, Total 354 352
Retail [Member] | NAFTA [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total 16 18
With an allowance recorded, Recorded Investment 32 39
With an allowance recorded, Unpaid Principal Balance 30 37
With an allowance recorded, Average recorded investment 33 41
Retail [Member] | EMEA [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total 191 170
With an allowance recorded, Recorded Investment 266 260
With an allowance recorded, Unpaid Principal Balance 266 260
With an allowance recorded, Average recorded investment 278 277
Retail [Member] | LATAM [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total 21 22
With an allowance recorded, Recorded Investment 35 45
With an allowance recorded, Unpaid Principal Balance 35 45
With an allowance recorded, Average recorded investment 39 32
Retail [Member] | APAC [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total 3 2
With an allowance recorded, Recorded Investment 5 3
With an allowance recorded, Unpaid Principal Balance 5 3
With an allowance recorded, Average recorded investment 4 2
Wholesale [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total 161 164
Recorded Investment, Total 327 540
Unpaid Principal Balance, Total 317 527
Average recorded investment, Total 341 524
Wholesale [Member] | NAFTA [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total 4 3
With an allowance recorded, Recorded Investment 30 44
With an allowance recorded, Unpaid Principal Balance 29 44
With an allowance recorded, Average recorded investment 40 49
Wholesale [Member] | EMEA [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total 132 134
With an allowance recorded, Recorded Investment 264 457
With an allowance recorded, Unpaid Principal Balance 264 457
With an allowance recorded, Average recorded investment 265 443
Wholesale [Member] | LATAM [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total 19 21
With an allowance recorded, Recorded Investment 25 30
With an allowance recorded, Unpaid Principal Balance 16 17
With an allowance recorded, Average recorded investment 27 28
Wholesale [Member] | APAC [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance, Total 6 6
With an allowance recorded, Recorded Investment 8 9
With an allowance recorded, Unpaid Principal Balance 8 9
With an allowance recorded, Average recorded investment $ 9 $ 4