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Number Of Rating Agencies

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Long-Term Debt - Narrative (Details)	3 Months Ended		12 Months Ended
Long-Term Debt - Narrative (Details)	Dec. 31, 2018 USD ($) aircraft	Jun. 30, 2018 USD ($) rating_agency	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Proceeds from long-term obligations			$ 3,745,000,000	$ 2,454,000,000	$ 450,000,000
Number of rating agencies \| rating_agency		2
Aircraft-Secured Loans \| Secured Debt
Debt Instrument [Line Items]
Proceeds from long-term obligations	$ 621,000,000
Number of aircraft used to secure loans \| aircraft	10
2018 Unsecured Notes \| Unsecured Debt
Debt Instrument [Line Items]
Proceeds from long-term obligations		$ 1,600,000,000
2018 Unsecured Notes \| Unsecured Debt \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		1.17%
3.4% 2018 unsecured notes \| Unsecured Debt
Debt Instrument [Line Items]
Proceeds from long-term obligations		$ 600,000,000
Interest rate per annum (percent)		3.40%
Maturity date		Dec. 31, 2021
3.8% 2018 unsecured notes \| Unsecured Debt
Debt Instrument [Line Items]
Proceeds from long-term obligations		$ 500,000,000
Interest rate per annum (percent)		3.80%
Maturity date		Dec. 31, 2023
4.375% 2018 unsecured notes \| Unsecured Debt
Debt Instrument [Line Items]
Proceeds from long-term obligations		$ 500,000,000
Interest rate per annum (percent)		4.375%
Maturity date		Dec. 31, 2028
2018 Revolving Credit Facility \| Unsecured Debt
Debt Instrument [Line Items]
Line of credit borrowing capacity		$ 2,650,000,000
2018 Revolving Credit Facility \| Unsecured Debt \| Letters of Credit
Debt Instrument [Line Items]
Component of line of credit available for letters of credit		500,000,000
Three-year revolving credit facility 2018 \| Unsecured Debt
Debt Instrument [Line Items]
Line of credit borrowing capacity		$ 1,325,000,000
Debt instrument term		3 years
Five-year revolving credit facility 2018 \| Unsecured Debt
Debt Instrument [Line Items]
Line of credit borrowing capacity		$ 1,325,000,000
Debt instrument term		5 years
NYTDC Special Facilities Revenue Bonds, Series 2018 \| Bonds
Debt Instrument [Line Items]
Debt instrument face amount		$ 1,400,000,000