Fair Value - Summary of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 27, 2020	Dec. 31, 2019	Sep. 29, 2019
Fair Value
ASSETS
Finance receivables, net	$ 6,954,661	$ 7,419,627	$ 7,561,797
Liabilities
Deposits	29,999	0	0
Fair Value \| Medium-term notes
Debt
Long-term debt, fair value	4,895,006	4,816,153	4,138,941
Fair Value \| Senior notes
Debt
Long-term debt, fair value	798,411	774,949	773,434
Fair Value \| Asset-backed U.S. commercial paper conduit facilities \| Secured Debt
Debt
Long-term debt, fair value	467,338	490,427	552,757
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt
Long-term debt, fair value	127,500	114,693	128,368
Fair Value \| Asset-backed securitization debt \| Secured Debt
Debt
Long-term debt, fair value	2,123,715	768,094	877,423
Fair Value \| Unsecured commercial paper
Debt
Unsecured commercial paper	1,077,763	571,995	1,013,137
Fair Value \| U.S. Line of Credit
Debt
Unsecured commercial paper	150,000	0	0
Carrying Value
ASSETS
Finance receivables, net	6,843,492	7,374,366	7,515,580
Liabilities
Deposits	29,999	0	0
Carrying Value \| Medium-term notes
Debt
Long-term debt, fair value	4,845,961	4,760,127	4,089,591
Carrying Value \| Senior notes
Debt
Long-term debt, fair value	743,806	743,296	743,127
Carrying Value \| Asset-backed U.S. commercial paper conduit facilities \| Secured Debt
Debt
Long-term debt, fair value	467,338	490,427	552,757
Carrying Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt
Long-term debt, fair value	127,500	114,693	128,368
Carrying Value \| Asset-backed securitization debt \| Secured Debt
Debt
Long-term debt, fair value	2,096,355	764,392	872,871
Carrying Value \| Unsecured commercial paper
Debt
Unsecured commercial paper	1,077,763	571,995	1,013,137
Carrying Value \| U.S. Line of Credit
Debt
Unsecured commercial paper	$ 150,000	$ 0	$ 0

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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- References

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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
-Subparagraph (SX 210.5-02.3(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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

No definition available.

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