Changes in Accumulated Other Comprehensive (Loss) Income - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Changes in accumulated other comprehensive loss by component
Beginning balance	$ 12,163,846	$ 11,105,461
Other comprehensive income (loss) before reclassifications	(204,172)	(302,817)
Amounts reclassified from accumulated other comprehensive loss	132,778	(15,812)
Net current-period other comprehensive income (loss)	(71,394)	(318,629)
Ending balance	8,328,594	11,976,907
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	(172,323)	(271,726)
Amounts reclassified from accumulated other comprehensive loss	62,184	(16,389)
Net current-period other comprehensive income (loss)	(110,139)	(288,115)
Ending balance	(798,668)	(825,331)
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	(18,503)	(23,408)
Amounts reclassified from accumulated other comprehensive loss	1,550	577
Net current-period other comprehensive income (loss)	(16,953)	(22,831)
Ending balance	(62,511)	(48,854)
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss by component
Beginning balance	(63,626)	(64,495)
Other comprehensive income (loss) before reclassifications	(13,346)	(7,683)
Amounts reclassified from accumulated other comprehensive loss	69,044	0
Net current-period other comprehensive income (loss)	55,698	(7,683)
Ending balance	(7,928)	(72,178)
Accumulated other comprehensive loss
Changes in accumulated other comprehensive loss by component
Beginning balance	(797,713)	(627,734)
Ending balance	$ (869,107)	$ (946,363)

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

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