Debt - Summary of Debt (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total secured and unsecured debt	$ 15,685	$ 9,991
Unamortized premium and debt issuance cost, net and other	155	115
Total debt	15,840	10,106
Less: current maturities	(4,090)	(2,054)
Total long-term debt	$ 11,750	8,052
Unsecured notes \| Unsecured Debt
Debt Instrument [Line Items]
Maturity dates range, start	Apr. 01, 2020
Maturity dates range, end	Dec. 31, 2029
Debt, gross	$ 4,550	5,550
Unsecured notes \| Unsecured Debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	2.60%
Unsecured notes \| Unsecured Debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	4.38%
2020 Secured Term Loan Facility \| Term Loan
Debt Instrument [Line Items]
Maturity date	Mar. 31, 2021
Debt, gross	$ 2,700	0
2020 Secured Term Loan Facility \| Term Loan \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	2.75%
2020 Secured Term Loan Facility \| Term Loan \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	2.96%
Financing secured by aircraft - Certificates \| Secured Debt
Debt Instrument [Line Items]
Maturity dates range, start	Apr. 01, 2020
Maturity dates range, end	Dec. 31, 2028
Debt, gross	$ 2,611	1,669
Financing secured by aircraft - Certificates \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	2.00%
Financing secured by aircraft - Certificates \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	8.02%
Financing secured by aircraft - Notes \| Secured Debt
Debt Instrument [Line Items]
Maturity dates range, start	Apr. 01, 2020
Maturity dates range, end	Dec. 31, 2025
Debt, gross	$ 1,243	1,193
Financing secured by aircraft - Notes \| Secured Debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	1.37%
Financing secured by aircraft - Notes \| Secured Debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	6.03%
NYTDC Special Facilities Revenue Bonds, Series 2018 \| Bonds
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2022
Maturity dates range, end	Dec. 31, 2036
Debt, gross	$ 1,383	1,383
NYTDC Special Facilities Revenue Bonds, Series 2018 \| Bonds \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	4.00%
NYTDC Special Facilities Revenue Bonds, Series 2018 \| Bonds \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	5.00%
Other financings \| Secured and Unsecured Debt
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2021
Maturity dates range, end	Dec. 31, 2030
Debt, gross	$ 256	196
Other financings \| Secured and Unsecured Debt \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	1.99%
Other financings \| Secured and Unsecured Debt \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	8.75%
2018 Unsecured Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maturity dates range, start	Jan. 01, 2021
Maturity dates range, end	Dec. 31, 2023
Interest rate per annum (percent)	2.45%
Debt, gross	$ 2,650	0
Other revolving credit facilities \| Revolving Credit Facility
Debt Instrument [Line Items]
Maturity dates range, start	Apr. 01, 2020
Maturity dates range, end	Dec. 31, 2021
Debt, gross	$ 292	$ 0
Other revolving credit facilities \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Interest rate per annum (percent)	2.37%
Other revolving credit facilities \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Interest rate per annum (percent)	3.21%

Debt, Long-term And Short-term, Combined Amount, Gross

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- Definition

Debt, Long-Term Debt Current And Short-Term Debt

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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-Subparagraph (b)(1)
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- Definition

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

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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.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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