Changes in Accumulated Other Comprehensive (Loss) Income - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Changes in accumulated other comprehensive loss by component
Beginning balance	$ 12,163,846	$ 11,105,461
Ending balance	10,231,775	11,269,070
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	(322,985)	61,565
Amounts reclassified from accumulated other comprehensive loss	22,380	(12,722)
Net current-period other comprehensive income (loss)	(300,605)	48,843
Ending balance	(989,134)	(488,373)
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	(8,094)	(841)
Amounts reclassified from accumulated other comprehensive loss	505	188
Net current-period other comprehensive income (loss)	(7,589)	(653)
Ending balance	(53,147)	(26,676)
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss by component
Beginning balance	(63,626)	(64,495)
Other comprehensive income (loss) before reclassifications	10,290	564
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive income (loss)	10,290	564
Ending balance	(53,336)	(63,931)
Accumulated other comprehensive loss
Changes in accumulated other comprehensive loss by component
Beginning balance	(797,713)	(627,734)
Other comprehensive income (loss) before reclassifications	(320,789)	61,288
Amounts reclassified from accumulated other comprehensive loss	22,885	(12,534)
Net current-period other comprehensive income (loss)	(297,904)	48,754
Ending balance	$ (1,095,617)	$ (578,980)

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

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