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Financial Instruments - Commercial Paper Program (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Feb. 28, 2013
Short-term Debt [Line Items]        
Interest expense, net of capitalized interest $ 53,000,000 $ 56,000,000    
Line of credit facility 0   $ 0  
Commercial Paper $ 0   $ 0  
Commercial Paper        
Short-term Debt [Line Items]        
Capacity of commercial paper program       $ 1,000,000,000.0