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Financial Instruments - Commercial Paper Program (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Feb. 28, 2013
Short-term Debt [Line Items]            
Interest expense, net of capitalized interest $ 62,000,000 $ 56,000,000 $ 173,000,000 $ 167,000,000    
Line of credit facility 0   0   $ 0  
Commercial Paper $ 0   $ 0   $ 0  
Commercial Paper            
Short-term Debt [Line Items]            
Capacity of commercial paper program           $ 1,000,000,000.0