Fair Value - Summary of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020	Sep. 27, 2020
Fair Value
ASSETS
Finance receivables, net	$ 7,117,828	$ 6,586,348	$ 6,954,661
Liabilities
Deposits, net	292,284	79,965	29,999
Fair Value \| Medium-term notes
Debt
Long-term debt, fair value	3,583,411	5,118,928	4,895,006
Fair Value \| Senior notes
Debt
Long-term debt, fair value	798,518	828,141	798,411
Fair Value \| Asset-backed U.S. commercial paper conduit facilities \| Secured Debt
Debt
Long-term debt, fair value	242,254	402,205	467,338
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt
Long-term debt, fair value	98,310	116,678	127,500
Fair Value \| Asset-backed securitization debt \| Secured Debt
Debt
Long-term debt, fair value	1,967,893	1,817,892	2,123,715
Fair Value \| Unsecured commercial paper
Debt
Unsecured commercial paper	749,620	1,014,274	1,077,763
Fair Value \| U.S. Line of Credit
Debt
Unsecured commercial paper	0	0	150,000
Carrying Value
ASSETS
Finance receivables, net	6,863,258	6,443,008	6,843,492
Liabilities
Deposits, net	290,270	79,965	29,999
Carrying Value \| Medium-term notes
Debt
Long-term debt, fair value	3,444,664	4,917,714	4,845,961
Carrying Value \| Senior notes
Debt
Long-term debt, fair value	744,494	743,977	743,806
Carrying Value \| Asset-backed U.S. commercial paper conduit facilities \| Secured Debt
Debt
Long-term debt, fair value	242,254	402,205	467,338
Carrying Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt
Long-term debt, fair value	98,310	116,678	127,500
Carrying Value \| Asset-backed securitization debt \| Secured Debt
Debt
Long-term debt, fair value	1,952,368	1,791,956	2,096,355
Carrying Value \| Unsecured commercial paper
Debt
Unsecured commercial paper	749,620	1,014,274	1,077,763
Carrying Value \| U.S. Line of Credit
Debt
Unsecured commercial paper	$ 0	$ 0	$ 150,000

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

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-Topic 470
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-Publisher FASB
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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

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- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

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