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Debt - Narrative 2024 (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2024
Nov. 30, 2024
Mar. 31, 2024
Dec. 31, 2024
Nov. 22, 2024
Dec. 31, 2023
May 25, 2023
Debt Instrument [Line Items]              
Long-term debt, excluding finance lease obligations, 2025 $ 735     $ 735      
Long-term debt, excluding finance lease obligations, 2026 704     704      
Long-term debt, excluding finance lease obligations, 2027 778     778      
Long-term debt, excluding finance lease obligations, 2028 664     664      
Long-term debt, excluding finance lease obligations, 2029 997     997      
Debt at face value 24,085     24,085   $ 18,413  
Debt instrument, repurchased face amount 3,768     3,768     $ 1,133
Debt repurchase, premiums paid 283            
Loss on extinguishment of debt       173      
Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Debt at face value 283     283   283  
4.4% Notes due 2027 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross 424     424   $ 0  
Stated interest rate           4.40%  
Debt instrument, exchange amount 228     228      
5.3% Notes due 2029 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross 86     86   $ 0  
Stated interest rate           5.30%  
6.8% Notes due 2032 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross 180     180   $ 0  
Stated interest rate           6.80%  
5.70% Notes due 2034 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross 103     103   $ 0  
Stated interest rate           5.70%  
Debt instrument, exchange amount 63     63      
6.6% Notes due 2037 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross 335     335   $ 0  
Stated interest rate           6.60%  
Debt instrument, exchange amount 259     259      
5.20% Notes due 2045 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross 186     186   $ 0  
Stated interest rate           5.20%  
Debt instrument, exchange amount 151     151      
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     200      
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     200      
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     200      
5.3% Note due 2029 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt instrument, exchange amount 59     59      
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]              
Long-term and short-term, combined amount, gross 705     705   $ 1,195  
Debt at face value $ 1,195     $ 1,195      
Stated interest rate 6.95%     6.95%      
Debt instrument, repurchased face amount $ 490     $ 490      
8.125% Notes due 2030 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross 207     207   390  
Debt at face value $ 390     $ 390      
Stated interest rate 8.125%     8.125%      
Debt instrument, repurchased face amount $ 183     $ 183      
7.4% Notes due 2031 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross 232     232   382  
Debt at face value $ 382     $ 382      
Stated interest rate 7.40%     7.40%      
Debt instrument, repurchased face amount $ 151     $ 151      
7.25% Notes due 2031 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross 268     268   400  
Debt at face value $ 400     $ 400      
Stated interest rate 7.25%     7.25%      
Debt instrument, repurchased face amount $ 132     $ 132      
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 | 5.00% 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 | 5.500% 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%      
3.30% Revenue Refunding Bonds | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross $ 400     $ 400      
Stated interest rate 3.30%     3.30%      
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   0  
3.35% Notes due 2024 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross $ 0     $ 0   265  
Debt at face value             $ 426
Stated interest rate 3.35% 3.35%   3.35%     3.35%
Debt instrument, repurchased face amount             $ 160
Retirement of debt   $ 265          
2.125% Notes due 2024 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross $ 0     $ 0   $ 461  
Debt at face value             $ 900
Stated interest rate 2.125%   2.125% 2.125%     2.125%
Debt instrument, repurchased face amount             $ 439
Retirement of debt     $ 461        
Sub-Series 2017C | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Long-term and short-term, combined amount, gross $ 400     $ 400      
Stated interest rate 3.30%     3.30%      
Marathon Oil Corporation              
Debt Instrument [Line Items]              
Long-term debt         $ 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    
Marathon Oil Corporation | 4.4% Notes due 2027 | 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      
Marathon Oil Corporation | 5.3% Notes due 2029 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Debt at face value         $ 600    
Stated interest rate         5.30%    
Marathon Oil Corporation | 6.8% Notes due 2032 | 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      
Marathon Oil Corporation | 5.70% Notes due 2034 | 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      
Marathon Oil Corporation | 6.6% Notes due 2037 | 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      
Marathon Oil Corporation | 5.20% Notes due 2045 | 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      
Marathon Oil Corporation | 2.20% Revenue Refunding Bonds | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Stated interest rate 2.20%     2.20%      
Marathon Oil Corporation | 2.375% Revenue Refunding Bonds | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Stated interest rate 2.375%     2.375%      
Marathon Oil Corporation | 4.05% Revenue Refunding Bonds | Variable Rate Debt Bonds              
Debt Instrument [Line Items]              
Stated interest rate 4.05%     4.05%      
Marathon Oil Corporation | 5.3% Note due 2029 | Notes Payable to Banks              
Debt Instrument [Line Items]              
Stated interest rate 5.30%     5.30%      
Debt instrument, repurchased face amount $ 514     $ 514