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Debt - Schedule of Fair Value (Details) - Level 2 - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
2022 Notes    
Debt Instrument [Line Items]    
Estimated fair values of notes $ 425 $ 687
2030 Notes    
Debt Instrument [Line Items]    
Estimated fair values of notes $ 1,405 $ 1,463