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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 02, 2021
Apr. 24, 2020
Debt Instrument [Line Items]          
Other $ (19)   $ (18)    
Long-term debt 4,162   4,232    
Less: amount due within one year 0   5    
 Total long-term debt $ 4,162   $ 4,227    
5.125% Notes, due 2024          
Debt Instrument [Line Items]          
Long- term debt, interest rate 5.125% 5.125% 5.125%    
Amount outstanding $ 1,081   $ 1,150    
6.875% Notes, due 2025          
Debt Instrument [Line Items]          
Long- term debt, interest rate 6.875%     6.875% 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