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Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2020
May 21, 2020
Apr. 24, 2020
Apr. 06, 2020
Dec. 31, 2019
Debt Instrument [Line Items]          
Other $ (6)       $ 13
Long-term debt 5,081       5,940
Less: amount due within one year 384       1,034
Total long-term debt $ 4,697       4,906
6.150% Notes, due 2020          
Debt Instrument [Line Items]          
Long-term debt, interest rate (percentage) 6.15%     6.15%  
Amount outstanding $ 0       1,000
5.400% Notes, due 2021          
Debt Instrument [Line Items]          
Long-term debt, interest rate (percentage) 5.40% 5.40%   5.40%  
Amount outstanding $ 361       1,250
5.870% Notes, due 2022          
Debt Instrument [Line Items]          
Long-term debt, interest rate (percentage) 5.87% 5.87%      
Amount outstanding $ 476       627
5.125% Notes, due 2024          
Debt Instrument [Line Items]          
Long-term debt, interest rate (percentage) 5.125%        
Amount outstanding $ 1,250       1,250
6.875% Notes, due 2025          
Debt Instrument [Line Items]          
Long-term debt, interest rate (percentage) 6.875%   6.875%    
Amount outstanding $ 1,200       0
5.900% Notes, due 2027          
Debt Instrument [Line Items]          
Long-term debt, interest rate (percentage) 5.90%        
Amount outstanding $ 625       625
6.750% Bonds, due 2028          
Debt Instrument [Line Items]          
Long-term debt, interest rate (percentage) 6.75%        
Amount outstanding $ 300       300
5.950% Notes due 2037          
Debt Instrument [Line Items]          
Long-term debt, interest rate (percentage) 5.95%        
Amount outstanding $ 625       625
4.750% Iowa Finance Authority Loan, due 2042          
Debt Instrument [Line Items]          
Long-term debt, interest rate (percentage) 4.75%        
Amount outstanding $ 250       $ 250