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Derivatives and Financial Instruments (Narrative) (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Percentage of derivative contract volume expiring within twelve months (at least) 98.00% 98.00%
Cash Flow Hedging | Interest rate derivatives    
Derivative [Line Items]    
Derivative, notional amount $ 650,000,000  
General and Administrative Expenses | Designated as Hedging Instrument | Cash Flow Hedging | Interest rate derivatives    
Derivative [Line Items]    
Losses reclassified from AOCI into income $ 7,000,000  
Facilities | Maximum    
Derivative [Line Items]    
Lessee leasing arrangements, operating leases, term of contract 5 years