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Debt - Narrative 2023 (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
May 25, 2023
Nov. 30, 2024
Dec. 31, 2023
Mar. 31, 2024
Dec. 31, 2024
Oct. 04, 2023
Sep. 30, 2023
May 23, 2023
Debt Instrument [Line Items]                
Debt at face value     $ 18,413   $ 24,085      
Debt instrument, repurchased face amount $ 1,133       3,768      
Incurred debt discount 33              
Gain (loss) on repurchase of debt instrument $ 27              
Revolving Credit Facility                
Debt Instrument [Line Items]                
Project finance facility, maximum borrowing capacity         5,500      
Minimum limit of debt for cross default provision     200          
Commercial paper program, amount outstanding         0      
Remaining borrowing capacity under revolving credit facility     5,500   5,500      
Letter of Credit | Maximum                
Debt Instrument [Line Items]                
Line of credit facility, capacity available for specific purpose other than for trade purchases         500      
Surmont                
Debt Instrument [Line Items]                
Interest acquired           50.00%    
Variable Rate Debt Bonds                
Debt Instrument [Line Items]                
Debt at face value     283   $ 283      
7.65% Debentures due 2023 | Notes Payable to Banks                
Debt Instrument [Line Items]                
Retirement of debt     $ 78          
Stated interest rate     7.65%          
10, 30, and 40 Year Senior Notes | Notes Payable to Banks                
Debt Instrument [Line Items]                
Debt at face value             $ 2,700  
5.05% Note due 2033 | Notes Payable to Banks                
Debt Instrument [Line Items]                
Stated interest rate             5.05%  
Debt at face value             $ 1,000  
5.55% Note due 2054 | Notes Payable to Banks                
Debt Instrument [Line Items]                
Stated interest rate             5.55%  
Debt at face value             $ 1,000  
5.7% Note due 2063 | Notes Payable to Banks                
Debt Instrument [Line Items]                
Stated interest rate             5.70%  
Debt at face value             $ 700  
5.3% Note due 2053 | Notes Payable to Banks                
Debt Instrument [Line Items]                
Stated interest rate               5.30%
Debt at face value               $ 1,100
2.125% Notes due 2024 | Notes Payable to Banks                
Debt Instrument [Line Items]                
Retirement of debt       $ 461        
Stated interest rate 2.125%     2.125% 2.125%      
Debt at face value $ 900              
Debt instrument, repurchased face amount $ 439              
3.35% Notes due 2024 | Notes Payable to Banks                
Debt Instrument [Line Items]                
Retirement of debt   $ 265            
Stated interest rate 3.35% 3.35%     3.35%      
Debt at face value $ 426              
Debt instrument, repurchased face amount $ 160              
2.4% Notes due 2025 | Notes Payable to Banks                
Debt Instrument [Line Items]                
Stated interest rate 2.40%       2.40%      
Debt at face value $ 900              
Debt instrument, repurchased face amount $ 534