Changes in Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassifications out of accumulated other comprehensive loss
Interest expense, net of interest capitalized	$ (304,811)	$ (218,889)	$ (577,325)	$ (311,800)
Depreciation and amortization expenses	(323,439)	(319,757)	(633,605)	(644,087)
Other income (expense)	24,508	(83,825)	29,541	(116,684)
Fuel	(59,109)	(79,192)	(100,931)	(273,460)
Other operating	(424,830)	(680,420)	(708,317)	(2,191,239)
Other operating
Reclassifications out of accumulated other comprehensive loss
Other operating	(167,099)	(279,465)	(296,226)	(703,463)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income
Reclassifications out of accumulated other comprehensive loss
Total reclassifications for the period	(9,849)	(57,745)	(21,821)	(80,630)
Loss on cash flow derivative hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income
Reclassifications out of accumulated other comprehensive loss
Total reclassifications for the period	(8,302)	(22,917)	(19,531)	(45,297)
Loss on cash flow derivative hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Interest rate swaps
Reclassifications out of accumulated other comprehensive loss
Interest expense, net of interest capitalized	(11,448)	(6,016)	(20,957)	(9,407)
Loss on cash flow derivative hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Foreign currency forward contracts
Reclassifications out of accumulated other comprehensive loss
Depreciation and amortization expenses	(3,855)	(3,780)	(7,636)	(7,117)
Other income (expense)	(515)	(2,581)	(1,806)	(4,344)
Loss on cash flow derivative hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Fuel swaps
Reclassifications out of accumulated other comprehensive loss
Other income (expense)	(7)	2,149	(414)	2,493
Fuel	7,523	(12,689)	11,282	(26,922)
Changes in defined benefit plans | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income
Reclassifications out of accumulated other comprehensive loss
Payroll and related	(1,547)	(528)	(2,290)	(1,033)
Total reclassifications for the period	(1,547)	(528)	(2,290)	(1,033)
Foreign currency translation adjustments | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Other operating
Reclassifications out of accumulated other comprehensive loss
Other operating	$ 0	$ (34,300)	$ 0	$ (34,300)