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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Jan. 15, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Other $ (13)   $ (12)
Long-term debt 4,713   5,075
Less: amount due within one year 489   376
Total long-term debt 4,224   $ 4,699
5.400% Notes, due 2021      
Debt Instrument [Line Items]      
Long-term debt, interest rate   5.40% 5.40%
Amount outstanding $ 0   $ 361
5.870% Notes, due 2022      
Debt Instrument [Line Items]      
Long-term debt, interest rate 5.87%    
Amount outstanding $ 476   476
5.125% Notes, due 2024      
Debt Instrument [Line Items]      
Long-term debt, interest rate 5.125%    
Amount outstanding $ 1,250   1,250
6.875% Notes, due 2025      
Debt Instrument [Line Items]      
Long-term debt, interest rate 6.875%    
Amount outstanding $ 1,200   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
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