Stockholder's Equity (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of accumulated other comprehensive income/(loss) [Line Items]
Total accumulated other comprehensive loss	$ 16,506,627	$ 15,586,599	$ 14,925,452	$ 15,281,472
Foreign currency translation
Summary of accumulated other comprehensive income/(loss) [Line Items]
Total accumulated other comprehensive loss	(719,814)	(868,006)
Derivative and financial instruments designated as hedges
Summary of accumulated other comprehensive income/(loss) [Line Items]
Total accumulated other comprehensive loss	607,657	738,777
Actuarial losses
Summary of accumulated other comprehensive income/(loss) [Line Items]
Total accumulated other comprehensive loss	0	(540)
Total accumulated other comprehensive loss
Summary of accumulated other comprehensive income/(loss) [Line Items]
Total accumulated other comprehensive loss	$ (112,157)	$ (129,769)	$ (111,465)	$ (169,531)