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Debt Financing (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 05, 2019 USD ($) | Nov. 30, 2011 USD ($) shares | Dec. 31, 2019 CAD ($) item aircraft | Dec. 31, 2018 USD ($) aircraft | Jan. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) item aircraft | Apr. 30, 2019 USD ($) | Mar. 31, 2013 USD ($)
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | $ 11,662,253,000 |  | $ 13,721,295,000 |  |
Less: Debt discounts and issuance costs |  |  |  | (123,348,000) |  | (142,429,000) |  |
Debt financing, net of discounts and issuance costs |  |  |  | 11,538,905,000 |  | 13,578,866,000 |  |
Unsecured Debt |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | 11,252,785,000 |  | 13,260,861,000 |  |
Senior Notes |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | $ 10,043,445,000 |  | $ 12,357,811,000 |  |
Senior Notes | LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) |  |  | 1.125% |  |  |  |  |
Senior Notes | Three-Month LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) |  |  | 0.67% |  |  |  |  |
Senior Notes | Minimum |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.125% | 2.125% |  | 2.125% |  |
Remaining term (in years) |  |  | 14 days |  |  |  |  |
Senior Notes | Maximum |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 4.85% | 7.375% |  | 4.85% |  |
Remaining term (in years) |  |  | 9 years 9 months 3 days |  |  |  |  |
Medium Term Note Program |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  | $ 1,400,000,000 | $ 2,850,000,000 |  |
Medium Term Note Program 4.25 Percent Due 2024 |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | $ 700,000,000.0 |  |
Interest rate (as a percent) |  |  | 4.25% |  |  | 4.25% |  |
Medium Term Note Program 3.75 Percent Due 2026 [Member] |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | $ 750,000,000.0 |  |
Interest rate (as a percent) |  |  | 3.75% |  |  | 3.75% |  |
Medium Term Note Program Due 2021 [Member] |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | $ 300,000,000.0 |  |
Medium Term Note Program Due 2021 [Member] | Three-Month LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 0.67% |  |  | 0.67% |  |
Medium Term Note Program 2.25 Percent Due 2023 [Member] |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | $ 600,000,000.0 |  |
Interest rate (as a percent) |  |  | 2.25% |  |  | 2.25% |  |
Medium Term Note Program 3.25 Percent Due 2029 [Member] |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | $ 500,000,000.0 |  |
Interest rate (as a percent) |  |  | 3.25% |  |  | 3.25% |  |
Medium Term Note Program 2.30 Percent Due 2025 [Member] |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  | $ 750,000,000.0 |  |  |
Interest rate (as a percent) |  |  |  |  | 2.30% |  |  |
Medium Term Note Program 3.00 Percent Due 2030 [Member] |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  | $ 650,000,000.0 |  |  |
Interest rate (as a percent) |  |  |  |  | 3.00% |  |  |
Unsecured Term financings |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | $ 607,340,000 |  | $ 883,050,000 |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | $ 205,000,000.0 |  |
Interest rate (as a percent) |  |  | 3.00% |  |  | 3.00% |  |
Number of additional term facilities entered into | item |  |  | 3 |  |  |  |  |
Unsecured Term financings | Minimum |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.75% |  |  | 2.75% |  |
Remaining term (in years) |  |  | 1 month 2 days |  |  |  |  |
Unsecured Term financings | Minimum | LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) |  |  | 0.95% |  |  |  |  |
Unsecured Term financings | Maximum |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 3.50% |  |  | 3.50% |  |
Remaining term (in years) |  |  | 4 years 9 months |  |  |  |  |
Unsecured Term financings | Maximum | LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) |  |  | 1.125% |  |  |  |  |
Unsecured Term Financing One |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | $ 80,000,000.0 |  |
Debt term |  |  | 1 year |  |  |  |  |
Unsecured Term Financing One | LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) |  |  | 1.00% |  |  |  |  |
Unsecured Term Financing Two |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Debt term |  |  | 3 years |  |  |  |  |
Unsecured Term Financing Two | Three-Month LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | 75,000,000.0 |  |
Interest margin (as a percent) |  |  | 1.00% |  |  |  |  |
Unsecured Term Financing Three |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | 50,000,000.0 |  |
Debt term |  |  | 1 year |  |  |  |  |
Unsecured Term Financing Three | LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) |  |  | 1.00% |  |  |  |  |
Unsecured Term Financing 1.125 Percent |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  | 518,000,000.0 |  | 600,000,000.0 |  |
Incremental borrowing capacity |  |  |  |  |  | 82,000,000.0 |  |
Debt term |  |  | 4 years |  |  |  |  |
Interest margin (as a percent) |  |  | 1.125% |  |  |  |  |
Unsecured Term Financing 3.00 Percent |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  | 5,400,000 |  | $ 25,000,000.0 |  |
Interest rate (as a percent) |  |  | 3.00% |  |  | 3.00% |  |
Incremental borrowing capacity |  |  |  |  |  | $ 19,600,000 |  |
Debt term |  |  | 4 years |  |  |  |  |
Uncommitted Unsecured Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  | 175,000,000.0 |  |
Revolving commitments held by lenders |  |  |  |  |  | 0 |  |
Uncommitted Unsecured Revolving Credit Facility [Member] | LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) |  |  | 0.75% |  |  |  |  |
Revolving Credit Facilities |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | 602,000,000 |  | $ 20,000,000 |  |
Secured Obligations |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 6,000,000,000.0 |  | $ 4,900,000,000 |
Incremental borrowing capacity |  |  |  |  | $ 125,000,000.0 |  | $ 310,000,000.0 |
Unsecured Revolving Credit Facility Maturing on May 5, 2020 |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Line of credit maturity amount | $ 92,700,000 |  |  |  |  |  |  |
Unsecured Revolving Credit Facility Mature On 5 May 2021 |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Revolving commitments held by lenders | 5,000,000.0 |  |  |  |  |  |  |
Unsecured Revolving Credit Facility Mature On 5 May 2022 |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Revolving commitments held by lenders | 245,000,000.0 |  |  |  |  |  |  |
Unsecured Revolving Credit Facility Mature On 5 May 2023 |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Maximum borrowing capacity | 5,800,000,000 |  |  |  |  |  |  |
Incremental borrowing capacity | 58,000,000.0 |  |  |  |  |  |  |
Revolving commitments held by lenders | $ 5,500,000,000 |  |  |  |  |  |  |
Facility fee (as a percent) | 0.20% |  |  |  |  |  |  |
Unsecured Revolving Credit Facility Mature On 5 May 2023 | LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) | 1.05% |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  | $ 151,000 |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  | $ 200,000,000.0 |  |  |  |  |  |
Interest rate (as a percent) |  | 3.875% |  |  |  |  |  |
Convertible Senior Notes | Class A Common Stock |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Conversion of convertible notes to Class A Common Stock |  | $ 199,800,000 |  |  |  |  |  |
Issuance of shares on conversion | shares |  | 6,838,546 |  |  |  |  |  |
Senior Unsecured Notes 2.625 Percent Due 2024 |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  | $ 400.0 |  |  |  |  |
Interest rate (as a percent) |  |  | 2.625% |  |  | 2.625% |  |
Senior Unsecured Notes 2.625 Percent Due 2024 | Currency Swap |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.535% |  |  | 2.535% |  |
Secured Debt |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | 409,468,000 |  | $ 460,434,000 |  |
Secured Obligations |  |  |  |  |  |  |  |
Nonrecourse |  |  |  | 167,245,000 |  | 128,460,000 |  |
Recourse |  |  |  | 242,223,000 |  | 331,974,000 |  |
Total |  |  |  | $ 409,468,000 |  | $ 460,434,000 |  |
Number of aircraft pledged as collateral | aircraft |  |  | 15 | 20 |  | 15 |  |
Net book value of aircraft pledged as collateral |  |  |  | $ 1,132,111,000 |  | $ 890,693,000 |  |
Secured Term Financings | Minimum |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Remaining term (in years) |  |  | 25 days |  |  |  |  |
Secured Term Financings | Maximum |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Remaining term (in years) |  |  | 9 years 10 months 2 days |  |  |  |  |
Export Credit Financing |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | 38,265,000 |  | 31,610,000 |  |
Debt financing, net of discounts and issuance costs |  |  |  | 38,300,000 |  | 31,600,000 |  |
Secured Obligations |  |  |  |  |  |  |  |
Principal amount issued |  |  |  |  |  |  |  | $ 76,500,000
Interest rate (as a percent) |  |  |  |  |  |  |  | 1.617%
Term Financings |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | $ 371,203,000 |  | $ 428,824,000 |  |
Secured Obligations |  |  |  |  |  |  |  |
Number of aircraft pledged as collateral |  |  | 15 | 18 |  | 15 |  |
Net book value of aircraft pledged as collateral |  |  |  | $ 1,100,000,000 |  | $ 890,700,000,000 |  |
Fixed rate debt |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | $ 500,000 |  | $ 54,600,000 |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.36% | 4.58% |  | 2.36% |  |
Floating rate debt |  |  |  |  |  |  |  |
Debt financing |  |  |  |  |  |  |  |
Total debt financing |  |  |  | $ 370,700,000 |  | $ 374,300,000 |  |
Floating rate debt | Minimum | LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) |  |  | 0.80% | 1.15% |  |  |  |
Floating rate debt | Maximum | LIBOR |  |  |  |  |  |  |  |
Secured Obligations |  |  |  |  |  |  |  |
Interest margin (as a percent) |  |  | 2.50% | 2.99% |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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