Debt - Schedule of ABS Notes Transactions (Details)		3 Months Ended
Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Principal Amount Issued	$ 1,510,000,000	$ 1,510,000,000
Asset Backed Notes
Debt Instrument [Line Items]
Principal Amount Issued	$ 1,122,000,000	$ 1,122,000,000
A-1a Senior class notes \| Asset Backed Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	2.93%	2.93%
Expected Weighted-average Life to Maturity	2 years 6 months
Principal Amount Issued	$ 900,000,000	$ 900,000,000
A-1b Senior floating rate class notes \| Asset Backed Notes
Debt Instrument [Line Items]
Expected Weighted-average Life to Maturity	2 years 6 months
Principal Amount Issued	$ 100,000,000	$ 100,000,000
Debt effective rate	2.495%	2.495%
B Junior class notes \| Asset Backed Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	3.02%	3.02%
Expected Weighted-average Life to Maturity	3 years 2 months 19 days
Principal Amount Issued	$ 69,000,000	$ 69,000,000
C Junior class notes \| Asset Backed Notes
Debt Instrument [Line Items]
Stated interest rate on debt instrument	3.22%	3.22%
Expected Weighted-average Life to Maturity	3 years 4 months 24 days
Principal Amount Issued	$ 53,000,000	$ 53,000,000
London Interbank Offered Rate (LIBOR) \| A-1b Senior floating rate class notes \| Asset Backed Notes
Debt Instrument [Line Items]
Basis spread on variable rate		0.33%

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

No definition available.

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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=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-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=109500613&loc=SL6036836-161870

Reference 2: 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=114775744&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=6877327&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
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

No definition available.

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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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