Description Of Business (Percentage Of Consumer Loans Assigned Based On Unit and Dollar Volumes) (Details)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Portfolio Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans in unit volume		67.90%	64.10%	67.20%
Percentage of new consumer loans in dollar volume	[1]	65.00%	60.60%	64.30%
Purchase Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans in unit volume		32.10%	35.90%	32.80%
Percentage of new consumer loans in dollar volume	[1]	35.00%	39.40%	35.70%

[1] Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. Payments of Dealer Holdback (as defined below) and accelerated Dealer Holdback are not included.