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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Aug. 04, 2021
Mar. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Long-term debt, gross $ 4,036     $ 5,436
Unamortized discount (3)     (5)
Unamortized debt issuance cost (19)     (27)
Total long-term debt 4,014     5,404
Debt immediately due if change in control $ 236      
Senior Unsecured Notes, 2.800%, Due 2022        
Debt Instrument [Line Items]        
Debt instrument, interest rate     2.80%  
Total long-term debt     $ 500  
Senior Unsecured Notes, 2.800%, Due 2022 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate 2.80%      
Long-term debt, gross $ 0     500
Senior Unsecured Notes, 9.375%, Due 2022 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate 9.375%      
Long-term debt, gross $ 32     32
Senior Unsecured Notes, Series A, Due 2022 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Long-term debt, gross $ 3     3
Senior Unsecured Notes, 8.500%, Due 2023 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate 8.50%      
Long-term debt, gross $ 70     70
Senior Unsecured Notes, 8.125%, Due 2023 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate 8.125%      
Long-term debt, gross $ 131     131
Senior Unsecured Notes, 3.850%, Due 2025        
Debt Instrument [Line Items]        
Debt instrument, interest rate   3.85%    
Total long-term debt   $ 900    
Senior Unsecured Notes, 3.850%, Due 2025 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate 3.85%      
Long-term debt, gross $ 0     900
Senior Unsecured Notes, 4.400%, Due 2027 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate 4.40%      
Long-term debt, gross $ 1,000     1,000
Senior Unsecured Notes, 6.800%, Due 2032 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate 6.80%      
Long-term debt, gross $ 550     550
Senior Unsecured Notes, 6.600%, Due 2037 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate 6.60%      
Long-term debt, gross $ 750     750
Senior Unsecured Notes, 5.200%, Due 2045 | Senior Unsecured Notes        
Debt Instrument [Line Items]        
Debt instrument, interest rate 5.20%      
Long-term debt, gross $ 500     500
Bonds, 2.00%, Due 2037 | Bonds        
Debt Instrument [Line Items]        
Debt instrument, interest rate 2.00%      
Long-term debt, gross $ 200     200
Bonds, 2.10%, Due 2037 | Bonds        
Debt Instrument [Line Items]        
Debt instrument, interest rate 2.10%      
Long-term debt, gross $ 200     200
Bonds, 2.20%, Due 2037 | Bonds        
Debt Instrument [Line Items]        
Debt instrument, interest rate 2.20%      
Long-term debt, gross $ 200     200
Bonds, 2.125%, Due 2037 | Bonds        
Debt Instrument [Line Items]        
Debt instrument, interest rate 2.125%      
Long-term debt, gross $ 200     200
Bonds, 2.375%, Due 2037 | Bonds        
Debt Instrument [Line Items]        
Debt instrument, interest rate 2.375%      
Long-term debt, gross $ 200     $ 200