Finance Receivables - Allowance For Credit Losses And Finance Receivables By Portfolio, Individually And Collectively Evaluated For Impairment (Details) - USD ($) $ in Thousands	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment			$ 2,100	$ 0
Collectively evaluated for impairment			196,481	194,996
Total allowance for credit losses	$ 411,015	$ 335,496	198,581	194,996	$ 190,872	$ 189,885
Individually evaluated for impairment			4,601	0
Collectively evaluated for impairment			7,568,346	7,789,401
Total	7,391,006		7,572,947	7,789,401
Retail
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			188,501	186,722
Total allowance for credit losses	389,758	311,368	188,501	186,722	181,426	182,098
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			6,416,428	6,549,707
Total	6,520,919		6,416,428	6,549,707
Wholesale
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment			2,100	0
Collectively evaluated for impairment			7,980	8,274
Total allowance for credit losses	21,257	$ 24,128	10,080	8,274	$ 9,446	$ 7,787
Individually evaluated for impairment			4,601	0
Collectively evaluated for impairment			1,151,918	1,239,694
Total	$ 870,087		$ 1,156,519	$ 1,239,694