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Debt - Narrative (Details)
$ in Millions
3 Months Ended
May 25, 2023
USD ($)
Jun. 30, 2023
transaction
Oct. 04, 2023
Sep. 30, 2023
USD ($)
May 23, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]            
Debt refinancing strategy, number of transactions | transaction   2        
Debt instrument, repurchased face amount $ 1,133       $ 1,100  
Debt repurchase, incurred debt discount 33          
Gain (loss) on repurchase of debt instrument 27          
Total debt       $ 19,100   $ 16,600
Surmont | Subsequent Event            
Debt Instrument [Line Items]            
Percentage of interest acquired     50.00%      
Notes Payable to Banks | 5.3% Note due 2053            
Debt Instrument [Line Items]            
Debt at face value         $ 1,100  
Stated interest rate         5.30%  
Notes Payable to Banks | 5.05% Note due 2033            
Debt Instrument [Line Items]            
Debt at face value       $ 1,000    
Stated interest rate       5.05%    
Notes Payable to Banks | 5.55% Note due 2054            
Debt Instrument [Line Items]            
Debt at face value       $ 1,000    
Stated interest rate       5.55%    
Notes Payable to Banks | 5.7% Note due 2063            
Debt Instrument [Line Items]            
Debt at face value       $ 700    
Stated interest rate       5.70%    
Notes Payable to Banks | 3.35% Notes due 2024            
Debt Instrument [Line Items]            
Debt at face value $ 426          
Stated interest rate 3.35%          
Debt instrument, repurchased face amount $ 160          
Notes Payable to Banks | 2.125% Notes due 2024            
Debt Instrument [Line Items]            
Debt at face value $ 900          
Stated interest rate 2.125%          
Debt instrument, repurchased face amount $ 439          
Notes Payable to Banks | 2.4% Notes due 2025            
Debt Instrument [Line Items]            
Debt at face value $ 900          
Stated interest rate 2.40%          
Debt instrument, repurchased face amount $ 534          
Notes Payable to Banks | 10, 30, and 40 Year Senior Notes            
Debt Instrument [Line Items]            
Debt at face value       $ 2,700    
Variable Rate Debt Bonds            
Debt Instrument [Line Items]            
Debt at face value       283    
Revolving Credit Facility            
Debt Instrument [Line Items]            
Project finance facility, maximum borrowing capacity       5,500    
Minimum limit of debt for cross default provision       200    
Letter of Credit | Maximum            
Debt Instrument [Line Items]            
Line of credit facility, capacity available for specific purpose other than for trade purchases       $ 500