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Long-Term Debt and Credit Facilities - Aggregate Principal Senior Notes Retired (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2024
Long-term Debt and Credit Facilities      
Aggregate principal $ 744    
Senior Notes      
Long-term Debt and Credit Facilities      
Aggregate principal   $ 1,554  
Senior Notes | 5.625% Senior Notes, Series X, due 2025      
Long-term Debt and Credit Facilities      
Stated interest rate (as a percent)   5.625%  
Aggregate principal   $ 49  
Senior Notes | 7.200% Senior Notes, Series D, due 2025      
Long-term Debt and Credit Facilities      
Stated interest rate (as a percent)   7.20%  
Aggregate principal   $ 21  
Senior Notes | 5.125% Senior Notes due 2026      
Long-term Debt and Credit Facilities      
Stated interest rate (as a percent)   5.125% 5.125%
Aggregate principal   $ 291  
Senior Notes | 6.875% Debentures, Series G, due 2028      
Long-term Debt and Credit Facilities      
Stated interest rate (as a percent)   6.875%  
Aggregate principal   $ 52  
Senior Notes | 5.375% Senior Notes due 2029      
Long-term Debt and Credit Facilities      
Stated interest rate (as a percent)   5.375%  
Aggregate principal   $ 275  
Senior Notes | 4.500% Senior Notes due 2029      
Long-term Debt and Credit Facilities      
Stated interest rate (as a percent)   4.50%  
Aggregate principal   $ 558  
Senior Notes | 7.600% Senior Notes, Series P, due 2039      
Long-term Debt and Credit Facilities      
Stated interest rate (as a percent)   7.60%  
Aggregate principal   $ 164  
Senior Notes | 7.650% Senior Notes, Series U, due 2042      
Long-term Debt and Credit Facilities      
Stated interest rate (as a percent)   7.65%  
Aggregate principal   $ 144