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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Debt Instrument [Line Items]        
Other $ (19)   $ (18)  
Long-term debt 4,171   4,232  
Less: amount due within one year 1   5  
Total long-term debt $ 4,170   4,227  
5.125% Notes, due 2024        
Debt Instrument [Line Items]        
Long-term debt, interest rate 5.125% 5.125%   5.125%
Amount outstanding $ 1,090   1,150  
6.875% Notes, due 2025        
Debt Instrument [Line Items]        
Long-term debt, interest rate 6.875%      
Amount outstanding $ 600   600  
5.900% Notes, due 2027        
Debt Instrument [Line Items]        
Long-term debt, interest rate 5.90%      
Amount outstanding $ 625   625  
6.750% Bonds, due 2028        
Debt Instrument [Line Items]        
Long-term debt, interest rate 6.75%      
Amount outstanding $ 300   300  
3.000% Notes, due 2029        
Debt Instrument [Line Items]        
Long-term debt, interest rate 3.00%      
Amount outstanding $ 700   700  
5.950% Notes, due 2037        
Debt Instrument [Line Items]        
Long-term debt, interest rate 5.95%      
Amount outstanding $ 625   625  
4.750% Iowa Finance Authority Loan, due 2042        
Debt Instrument [Line Items]        
Long-term debt, interest rate 4.75%      
Amount outstanding $ 250   $ 250