Finance Receivables - Allowance For Credit Losses And Finance Receivables By Portfolio, Individually And Collectively Evaluated For Impairment (Details) - USD ($)	Mar. 29, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment		$ 2,100,000	$ 0
Collectively evaluated for impairment		196,481,000	190,872,000
Total allowance for credit losses	$ 335,496,000	198,581,000	190,872,000	$ 189,885,000
Individually evaluated for impairment		4,601,000	0
Collectively evaluated for impairment		7,568,346,000	7,629,464,000
Total	7,627,903,000	7,572,947,000	7,629,464,000
Retail
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		188,501,000	181,426,000
Total allowance for credit losses	311,368,000	188,501,000	181,426,000	182,098,000
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		6,416,428,000	6,290,036,000
Total	6,269,247,000	6,416,428,000	6,290,036,000
Wholesale
Financing Receivable, Allowance for Credit Losses
Individually evaluated for impairment		2,100,000	0
Collectively evaluated for impairment		7,980,000	9,446,000
Total allowance for credit losses	24,128,000	10,080,000	9,446,000	$ 7,787,000
Individually evaluated for impairment		4,601,000	0
Collectively evaluated for impairment		1,151,918,000	1,339,428,000
Total	$ 1,358,656,000	$ 1,156,519,000	$ 1,339,428,000