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Long-term Debt (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Aggregate outstanding principal   $ 10,360,058,000     $ 14,759,260,000
Debt issuance cost         114,000,000
Foreign currency remeasurement gain on long-term debt $ 45,576,000 $ 73,953,000 $ (140,790,000)    
Senior Notes          
Debt Instrument [Line Items]          
Long-term notes denominated in foreign currency       € 4,700,000,000 $ 14,873,000,000
Foreign currency remeasurement gain on long-term debt $ 46,000,000        
Redemption price, percent of outstanding principal 101.00%