v3.25.4
Debt - Narrative 2024 (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2024
Nov. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Feb. 28, 2025
Nov. 22, 2024
Debt Instrument [Line Items]              
Debt at face value $ 24,085     $ 23,347 $ 24,085    
Debt instrument, repurchased face amount 3,768       3,768    
Debt repurchase, premiums paid 283            
Loss on extinguishment of debt         (173)    
Retirement of debt       700      
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 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      
Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Debt at face value 283     283 283    
Marathon Oil Corporation              
Debt Instrument [Line Items]              
Long-term debt   $ 4,700         $ 4,719
Debt instrument, original amount of exchanged debt 863       863    
Debt instrument, exchange amount 862       862    
Marathon Oil Corporation | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value   4,600          
4.05% Revenue Refunding Bonds              
Debt Instrument [Line Items]              
Debt at face value   $ 200          
Stated interest rate   4.05%          
4.05% Revenue Refunding Bonds | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross       $ 200      
4.05% Revenue Refunding Bonds | Marathon Oil Corporation | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Stated interest rate       4.05%      
4.4% Notes due 2027 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate       4.40%      
Debt instrument, exchange amount 228       228    
Long-term and short-term, combined amount, gross $ 424     $ 422 $ 424    
4.4% Notes due 2027 | Marathon Oil Corporation | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value   $ 1,000          
Stated interest rate 4.40% 4.40%     4.40%    
Debt instrument, repurchased face amount $ 576       $ 576    
5.3% Notes due 2029 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate       5.30%      
Long-term and short-term, combined amount, gross 86     $ 84 86    
5.3% Notes due 2029 | Marathon Oil Corporation | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value   $ 600          
Stated interest rate   5.30%          
6.8% Notes due 2032 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate       6.80%      
Long-term and short-term, combined amount, gross $ 180     $ 180 $ 180    
6.8% Notes due 2032 | Marathon Oil Corporation | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value   $ 550          
Stated interest rate 6.80% 6.80%     6.80%    
Debt instrument, repurchased face amount $ 370       $ 370    
Debt instrument, exchange amount 102       102    
5.7% Notes due 2034 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate       5.70%      
Debt instrument, exchange amount 63       63    
Long-term and short-term, combined amount, gross $ 103     $ 103 $ 103    
5.7% Notes due 2034 | Marathon Oil Corporation | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value   $ 600          
Stated interest rate 5.70% 5.70%     5.70%    
Debt instrument, repurchased face amount $ 497       $ 497    
6.6% Notes due 2037 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate       6.60%      
Debt instrument, exchange amount 259       259    
Long-term and short-term, combined amount, gross $ 335     $ 335 $ 335    
6.6% Notes due 2037 | Marathon Oil Corporation | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value   $ 750          
Stated interest rate 6.60% 6.60%     6.60%    
Debt instrument, repurchased face amount $ 415       $ 415    
5.2% Notes due 2045 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate       5.20%      
Debt instrument, exchange amount 151       151    
Long-term and short-term, combined amount, gross $ 186     $ 186 $ 186    
5.2% Notes due 2045 | Marathon Oil Corporation | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value   $ 500          
Stated interest rate 5.20% 5.20%     5.20%    
Debt instrument, repurchased face amount $ 314       $ 314    
2.20% Revenue Refunding Bonds              
Debt Instrument [Line Items]              
Debt at face value   $ 200          
Stated interest rate   2.20%          
2.20% Revenue Refunding Bonds | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross       $ 200      
2.20% Revenue Refunding Bonds | Marathon Oil Corporation | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Stated interest rate       2.20%      
2.375% Revenue Refunding Bonds              
Debt Instrument [Line Items]              
Debt at face value   $ 200          
Stated interest rate   2.375%          
2.375% Revenue Refunding Bonds | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross       $ 200      
2.375% Revenue Refunding Bonds | Marathon Oil Corporation | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Stated interest rate       2.375%      
5.3% Note due 2029 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt instrument, exchange amount $ 59       $ 59    
5.3% Note due 2029 | Marathon Oil Corporation | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate 5.30%       5.30%    
Debt instrument, repurchased face amount $ 514       $ 514    
7.8% Debentures due 2027 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value $ 203       $ 203    
Stated interest rate 7.80%       7.80%    
Debt instrument, repurchased face amount $ 83       $ 83    
7.0% Debentures due 2029 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value $ 112       $ 112    
Stated interest rate 7.00%       7.00%    
Debt instrument, repurchased face amount $ 17       $ 17    
7.375% Debentures due 2029 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value $ 92       $ 92    
Stated interest rate 7.375%       7.375%    
Debt instrument, repurchased face amount $ 26       $ 26    
6.95% Notes due 2029 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value $ 1,195       $ 1,195    
Stated interest rate 6.95%     6.95% 6.95%    
Debt instrument, repurchased face amount $ 490       $ 490    
Long-term and short-term, combined amount, gross 705     $ 705 705    
8.125% Notes due 2030 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value $ 390       $ 390    
Stated interest rate 8.125%     8.125% 8.125%    
Debt instrument, repurchased face amount $ 183       $ 183    
Long-term and short-term, combined amount, gross 207     $ 207 207    
7.4% Notes due 2031 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value $ 382       $ 382    
Stated interest rate 7.40%     7.40% 7.40%    
Debt instrument, repurchased face amount $ 151       $ 151    
Long-term and short-term, combined amount, gross 232     $ 232 232    
7.25% Notes due 2031 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value $ 400       $ 400    
Stated interest rate 7.25%     7.25% 7.25%    
Debt instrument, repurchased face amount $ 132       $ 132    
Long-term and short-term, combined amount, gross 268     $ 268 268    
Universal Shelf Registration Notes | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value 5,200       5,200    
Notes Payable to Banks | 4.7% Notes due 2030              
Debt Instrument [Line Items]              
Debt at face value $ 1,350       $ 1,350    
Stated interest rate 4.70%       4.70%    
Notes Payable to Banks | 4.85% Notes due 2032              
Debt Instrument [Line Items]              
Debt at face value $ 650       $ 650    
Stated interest rate 4.85%       4.85%    
Notes Payable to Banks | 5.0% Notes due 2035              
Debt Instrument [Line Items]              
Debt at face value $ 1,250       $ 1,250    
Stated interest rate 5.00%       5.00%    
Notes Payable to Banks | 5.5% Notes due 2055              
Debt Instrument [Line Items]              
Debt at face value $ 1,300       $ 1,300    
Stated interest rate 5.50%       5.50%    
Notes Payable to Banks | 5.65% Notes due 2065              
Debt Instrument [Line Items]              
Debt at face value $ 650       $ 650    
Stated interest rate 5.65%       5.65%    
Sub-Series 2017C | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Stated interest rate 3.30%       3.30%    
Long-term and short-term, combined amount, gross $ 400       $ 400    
Revenue Refunding Bonds Due 2037 | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross $ 1,000     $ 1,000 $ 1,000    
3.35% Notes due 2024 [Member] | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate   3.35%          
Retirement of debt   $ 265          
2.125% Note due 2024 [Member] | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate     2.125%        
Retirement of debt     $ 461