Fair Value Measurements and Derivative Instruments - Income Statement Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Effect of derivative instruments involved in hedging on the consolidated financial statements
Fuel	$ 59,109	$ 79,192	$ 100,931	$ 273,460
Depreciation and amortization	323,439	319,757	633,605	644,087
Interest Income (Expense)	(300,141)	(213,683)	(567,794)	(301,060)
Other income (expense)	24,508	(83,825)	29,541	(116,684)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	(8,302)	(22,917)	(19,531)	(45,297)
Interest Contracts \| Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	(11,448)	(6,016)	(20,957)	(9,407)
Fuel swaps \| Fuel
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	7,523	(12,689)	11,282	(26,922)
Fuel swaps \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	(7)	2,149	(414)	2,493
Foreign exchange contracts \| Depreciation and amortization expenses
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	(3,855)	(3,780)	(7,636)	(7,117)
Foreign exchange contracts \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	(515)	(2,581)	(1,806)	(4,344)
Interest rate swaps \| Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	(11,448)	(6,016)	(20,957)	(9,407)
Fair Value Hedging
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Hedged Item	2,068	(1,904)	4,998	(23,234)
Amount of Gain (Loss) Recognized in Income on Derivative	317	2,870	(234)	23,299
Fair Value Hedging \| Interest Contracts \| Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Hedged Item	2,068	(1,904)	4,998	(23,234)
Amount of Gain (Loss) Recognized in Income on Derivative	317	2,870	(234)	23,299
Fair Value Hedging \| Interest Contracts \| Other income (expense)
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Hedged Item	0	0	0	0
Amount of Gain (Loss) Recognized in Income on Derivative	0	0	0	0
Fair Value Hedging \| Interest rate swaps \| Interest expense, net of interest capitalized
Effect of derivative instruments involved in hedging on the consolidated financial statements
Amount of Gain (Loss) Recognized in Income on Hedged Item	2,068	(1,904)	4,998	(23,234)
Amount of Gain (Loss) Recognized in Income on Derivative	$ 317	$ 2,870	$ (234)	$ 23,299

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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