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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Sep. 02, 2021
Jan. 15, 2021
Dec. 31, 2020
May 21, 2020
Apr. 24, 2020
Apr. 06, 2020
Debt Instrument [Line Items]                
Other $ (18)       $ (12)      
Long-term debt 4,232       5,075      
Less: amount due within one year 5       376      
 Total long-term debt 4,227       $ 4,699      
5.400% Notes, due 2021                
Debt Instrument [Line Items]                
Long- term debt, interest rate       5.40% 5.40% 5.40%   5.40%
Amount outstanding 0       $ 361      
5.870% Notes, due 2022                
Debt Instrument [Line Items]                
Long- term debt, interest rate         5.87% 5.87%    
Amount outstanding $ 0       $ 476      
5.125% Notes, due 2024                
Debt Instrument [Line Items]                
Long- term debt, interest rate 5.125% 5.125%            
Amount outstanding $ 1,150       1,250      
6.875% Notes, due 2025                
Debt Instrument [Line Items]                
Long- term debt, interest rate 6.875%   6.875%       6.875%  
Amount outstanding $ 600       1,200      
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       0      
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