Fair Value - Summary of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Estimate of Fair Value Measurement
Assets:
Finance receivables, net	$ 6,586,348	$ 7,419,627
Liabilities:
Deposits	79,965	0
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed U.S. commercial paper conduit facilities
Liabilities:
Debt instrument, fair value	402,205	490,427
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Debt instrument, fair value	116,678	114,693
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed securitization debt
Liabilities:
Debt instrument, fair value	1,817,892	768,094
Estimate of Fair Value Measurement \| Medium-term Notes
Liabilities:
Debt instrument, fair value	5,118,928	4,816,153
Estimate of Fair Value Measurement \| Senior Notes
Liabilities:
Debt instrument, fair value	828,141	774,949
Estimate of Fair Value Measurement \| Unsecured Commercial Paper
Liabilities:
Unsecured commercial paper	1,014,274	571,995
Carrying Value
Assets:
Finance receivables, net	6,443,008	7,374,366
Liabilities:
Deposits	79,965	0
Carrying Value \| Secured Debt \| Asset-backed U.S. commercial paper conduit facilities
Liabilities:
Debt instrument, fair value	402,205	490,427
Carrying Value \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Debt instrument, fair value	116,678	114,693
Carrying Value \| Secured Debt \| Asset-backed securitization debt
Liabilities:
Debt instrument, fair value	1,791,956	764,392
Carrying Value \| Medium-term Notes
Liabilities:
Debt instrument, fair value	4,917,714	4,760,127
Carrying Value \| Senior Notes
Liabilities:
Debt instrument, fair value	743,977	743,296
Carrying Value \| Unsecured Commercial Paper
Liabilities:
Unsecured commercial paper	$ 1,014,274	$ 571,995

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

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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Period Type:	instant

- 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.

+ Details

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Period Type:	instant

- References

No definition available.

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- 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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