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Geographic Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($) destination	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) destination	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summarization of operating revenues by geographic regions
Total revenue | $	$ 661	$ 492	$ 215	$ 1,588	$ 2,031	$ 2,086	$ 2,105	$ 1,871	$ 2,957	$ 8,094	$ 7,658
Caribbean & Latin America
Segment Reporting Information [Line Items]
Number of destinations | destination	31								31
Summarization of operating revenues by geographic regions
Total revenue | $									$ 1,067	2,461	2,272
PUERTO RICO
Segment Reporting Information [Line Items]
Number of destinations | destination	3								3
U.S Virgin Islands
Segment Reporting Information [Line Items]
Number of destinations | destination	1								1
Domestic
Summarization of operating revenues by geographic regions
Total revenue | $									$ 1,890	$ 5,633	$ 5,386

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