Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Fair Value Measurements, Additional Information (Details)

v3.20.2
Financial Instruments - Fair Value Measurements, Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, fair value $ 1,520 $ 1,520
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Long-term debt, fair value $ 1,510 $ 1,580