Finance Receivables - Recorded Investment Of Retail and Wholesale Finance Receivables By Credit Quality Indicator (Details) - USD ($) $ in Thousands	Sep. 29, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Recorded Investment
Financing receivable, gross	$ 7,714,156	$ 7,411,816	$ 7,497,009
Retail
Financing Receivable, Recorded Investment
Financing receivable, gross	6,642,809	6,328,201	6,508,670
Retail | Prime
Financing Receivable, Recorded Investment
Financing receivable, gross	5,454,920	5,183,754	5,321,464
Retail | Sub-prime
Financing Receivable, Recorded Investment
Financing receivable, gross	1,187,889	1,144,447	1,187,206
Wholesale
Financing Receivable, Recorded Investment
Financing receivable, gross	1,071,347	1,083,615	988,339
Wholesale | Doubtful
Financing Receivable, Recorded Investment
Financing receivable, gross	4,964	2,210	0
Wholesale | Substandard
Financing Receivable, Recorded Investment
Financing receivable, gross	752	9,660	8,953
Wholesale | Special Mention
Financing Receivable, Recorded Investment
Financing receivable, gross	14,813	10,299	25,459
Wholesale | Medium Risk
Financing Receivable, Recorded Investment
Financing receivable, gross	11,544	25,802	15,825
Wholesale | Low Risk
Financing Receivable, Recorded Investment
Financing receivable, gross	$ 1,039,274	$ 1,035,644	$ 938,102