Debt - Schedule of ABS Notes Transactions (Details) - USD ($)	1 Months Ended
Sep. 30, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Principal Amount Issued	$ 2,123,000,000	$ 5,885,000,000
March 2020 ABS Notes
Debt Instrument [Line Items]
Principal Amount Issued		$ 1,600,000,000
March 2020 ABS Notes \| A-1a Senior class notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument		1.85%
Expected Weighted-average Life to Maturity		2 years 5 months 15 days
Principal Amount Issued		$ 1,326,000,000
March 2020 ABS Notes \| A-1b Senior floating rate class notes
Debt Instrument [Line Items]
Expected Weighted-average Life to Maturity		2 years 5 months 15 days
Principal Amount Issued		$ 100,000,000
Debt effective rate	14.80%
March 2020 ABS Notes \| B Junior class notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument		1.98%
Expected Weighted-average Life to Maturity		3 years 2 months 4 days
Principal Amount Issued		$ 98,000,000
March 2020 ABS Notes \| C Junior class notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument		2.06%
Expected Weighted-average Life to Maturity		3 years 4 months 9 days
Principal Amount Issued		$ 76,000,000
March 2020 ABS Notes \| London Interbank Offered Rate (LIBOR) \| A-1b Senior floating rate class notes
Debt Instrument [Line Items]
Basis spread on variable rate		0.27%
September 2020 ABS Notes
Debt Instrument [Line Items]
Principal Amount Issued	$ 1,600,000,000
September 2020 ABS Notes \| A Senior class notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	0.47%
Expected Weighted-average Life to Maturity	2 years 5 months 23 days
Principal Amount Issued	$ 1,426,000,000
September 2020 ABS Notes \| B Junior class notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	0.68%
Expected Weighted-average Life to Maturity	3 years 2 months 4 days
Principal Amount Issued	$ 98,000,000
September 2020 ABS Notes \| C Junior class notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	0.83%
Expected Weighted-average Life to Maturity	3 years 4 months 9 days
Principal Amount Issued	$ 76,000,000
Asset Backed Notes
Debt Instrument [Line Items]
Principal Amount Issued	$ 3,200,000,000

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

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-Topic 835
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-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

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-Topic 835
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-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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