Changes in Accumulated Other Comprehensive (Loss) Income - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Changes in accumulated other comprehensive loss by component
Beginning balance	$ 12,163,846	$ 11,105,461
Ending balance	8,963,905	11,538,403
Changes related to cash flow derivative hedges
Changes in accumulated other comprehensive loss by component
Beginning balance	(688,529)	(537,216)
Other comprehensive income (loss) before reclassifications	(221,571)	(3,249)
Amounts reclassified from accumulated other comprehensive loss	45,297	(19,642)
Net current-period other comprehensive income (loss)	(176,274)	(22,891)
Ending balance	(864,803)	(560,107)
Changes in defined benefit plans
Changes in accumulated other comprehensive loss by component
Beginning balance	(45,558)	(26,023)
Other comprehensive income (loss) before reclassifications	(14,900)	(10,758)
Amounts reclassified from accumulated other comprehensive loss	1,033	383
Net current-period other comprehensive income (loss)	(13,867)	(10,375)
Ending balance	(59,425)	(36,398)
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss by component
Beginning balance	(63,626)	(64,495)
Other comprehensive income (loss) before reclassifications	2,327	7,827
Amounts reclassified from accumulated other comprehensive loss	34,300	0
Net current-period other comprehensive income (loss)	36,627	7,827
Ending balance	(26,999)	(56,668)
Accumulated other comprehensive loss
Changes in accumulated other comprehensive loss by component
Beginning balance	(797,713)	(627,734)
Other comprehensive income (loss) before reclassifications	(234,144)	(6,180)
Amounts reclassified from accumulated other comprehensive loss	80,630	(19,259)
Net current-period other comprehensive income (loss)	(153,514)	(25,439)
Ending balance	$ (951,227)	$ (653,173)

Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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