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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Nov. 30, 2024
Nov. 22, 2024
Mar. 31, 2024
Dec. 31, 2023
May 25, 2023
Debt Instrument [Line Items]            
Finance leases $ 940       $ 1,129  
Net unamortized premiums, discounts and debt issuance costs (701)       (605)  
Total debt 24,324       18,937  
Short-term debt (1,035)       (1,074)  
Long-term debt 23,289       17,863  
Debt at face value 24,085       18,413  
Notes Payable to Banks | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Debt at face value     $ 4,600      
Variable Rate Debt Bonds            
Debt Instrument [Line Items]            
Debt at face value $ 283       283  
2.125% Notes due 2024 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 2.125%     2.125%   2.125%
Long-term and short-term, combined amount, gross $ 0       461  
Debt at face value           $ 900
3.35% Notes due 2024 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 3.35% 3.35%       3.35%
Long-term and short-term, combined amount, gross $ 0       265  
Debt at face value           $ 426
2.4% Notes due 2025 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 2.40%         2.40%
Long-term and short-term, combined amount, gross $ 366       366  
Debt at face value           $ 900
8.2% Debentures due 2025 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 8.20%          
Long-term and short-term, combined amount, gross $ 134       134  
3.35% Notes due 2025 | Debentures            
Debt Instrument [Line Items]            
Stated interest rate 3.35%          
Long-term and short-term, combined amount, gross $ 199       199  
6.875% Debentures due 2026 | Debentures            
Debt Instrument [Line Items]            
Stated interest rate 6.875%          
Long-term and short-term, combined amount, gross $ 67       67  
7.8% Debentures due 2027 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 7.80%          
Debt at face value $ 203          
7.8% Debentures due 2027 | Debentures            
Debt Instrument [Line Items]            
Stated interest rate 7.80%          
Long-term and short-term, combined amount, gross $ 120       $ 203  
4.4% Notes due 2027 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate         4.40%  
Long-term and short-term, combined amount, gross $ 424       $ 0  
4.4% Notes due 2027 | Notes Payable to Banks | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Stated interest rate 4.40%   4.40%      
Debt at face value     $ 1,000      
3.75% Notes due 2027 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 3.75%          
Long-term and short-term, combined amount, gross $ 196       196  
4.3% Notes due 2028 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 4.30%          
Long-term and short-term, combined amount, gross $ 223       223  
7.375% Debentures due 2029 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 7.375%          
Debt at face value $ 92          
7.375% Debentures due 2029 | Debentures            
Debt Instrument [Line Items]            
Stated interest rate 7.375%          
Long-term and short-term, combined amount, gross $ 66       92  
7.0% Debentures due 2029 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 7.00%          
Debt at face value $ 112          
7.0% Debentures due 2029 | Debentures            
Debt Instrument [Line Items]            
Stated interest rate 7.00%          
Long-term and short-term, combined amount, gross $ 95       $ 112  
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       $ 0  
5.3% Notes due 2029 | Notes Payable to Banks | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Stated interest rate     5.30%      
Debt at face value     $ 600      
6.95% Notes due 2029 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 6.95%          
Long-term and short-term, combined amount, gross $ 705       1,195  
Debt at face value $ 1,195          
4.7% Notes due 2030 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 4.70%          
Long-term and short-term, combined amount, gross $ 1,350       0  
8.125% Notes due 2030 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 8.125%          
Long-term and short-term, combined amount, gross $ 207       390  
Debt at face value $ 390          
2.4% Notes due 2031 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 2.40%          
Long-term and short-term, combined amount, gross $ 227       227  
7.2% Notes due 2031 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 7.20%          
Long-term and short-term, combined amount, gross $ 447       447  
7.25% Notes due 2031 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 7.25%          
Long-term and short-term, combined amount, gross $ 268       400  
Debt at face value $ 400          
7.4% Notes due 2031 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 7.40%          
Long-term and short-term, combined amount, gross $ 232       382  
Debt at face value $ 382          
4.85% Notes due 2032 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 4.85%          
Long-term and short-term, combined amount, gross $ 650       $ 0  
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       $ 0  
6.8% Notes due 2032 | Notes Payable to Banks | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Stated interest rate 6.80%   6.80%      
Debt at face value     $ 550      
5.9% Notes due 2032 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.90%          
Long-term and short-term, combined amount, gross $ 505       505  
5.05% Notes due 2033 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.05%          
Long-term and short-term, combined amount, gross $ 1,000       $ 1,000  
5.70% Notes due 2034 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate         5.70%  
Long-term and short-term, combined amount, gross $ 103       $ 0  
5.70% Notes due 2034 | Notes Payable to Banks | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Stated interest rate 5.70%   5.70%      
Debt at face value     $ 600      
4.15% Notes due 2034 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 4.15%          
Long-term and short-term, combined amount, gross $ 246       246  
5.00% Notes due 2035 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.00%          
Long-term and short-term, combined amount, gross $ 1,250       0  
5.95% Notes due 2036 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.95%          
Long-term and short-term, combined amount, gross $ 326       326  
5.951% Notes serially maturing 2022 through 2037 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.951%          
Long-term and short-term, combined amount, gross $ 573       $ 603  
6.6% Notes due 2037 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate         6.60%  
Long-term and short-term, combined amount, gross $ 335       $ 0  
6.6% Notes due 2037 | Notes Payable to Banks | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Stated interest rate 6.60%   6.60%      
Debt at face value     $ 750      
5.9% Notes due 2038 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.90%          
Long-term and short-term, combined amount, gross $ 350       350  
6.5% Notes due 2039 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 6.50%          
Long-term and short-term, combined amount, gross $ 1,588       1,588  
3.758% Notes due 2042 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 3.758%          
Long-term and short-term, combined amount, gross $ 785       785  
4.3% Notes due 2044 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 4.30%          
Long-term and short-term, combined amount, gross $ 750       $ 750  
5.20% Notes due 2045 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate         5.20%  
Long-term and short-term, combined amount, gross $ 186       $ 0  
5.20% Notes due 2045 | Notes Payable to Banks | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Stated interest rate 5.20%   5.20%      
Debt at face value     $ 500      
5.95% Notes due 2046 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.95%          
Long-term and short-term, combined amount, gross $ 329       329  
7.9% Debentures due 2047 | Debentures            
Debt Instrument [Line Items]            
Stated interest rate 7.90%          
Long-term and short-term, combined amount, gross $ 60       60  
4.875% Notes due 2047 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 4.875%          
Long-term and short-term, combined amount, gross $ 319       319  
4.85% Notes due 2048 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 4.85%          
Long-term and short-term, combined amount, gross $ 219       219  
3.8% Notes due 2052 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 3.80%          
Long-term and short-term, combined amount, gross $ 1,100       1,100  
5.3% Notes due 2053 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.30%          
Long-term and short-term, combined amount, gross $ 1,100       1,100  
5.55% Notes due 2054 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.55%          
Long-term and short-term, combined amount, gross $ 1,000       1,000  
5.500% Notes due 2055 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.50%          
Long-term and short-term, combined amount, gross $ 1,300       0  
4.025% Notes due 2062 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 4.025%          
Long-term and short-term, combined amount, gross $ 1,770       1,770  
5.70% Notes due 2063 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.70%          
Long-term and short-term, combined amount, gross $ 700       700  
5.65% Notes due 2065 | Notes Payable to Banks            
Debt Instrument [Line Items]            
Stated interest rate 5.65%          
Long-term and short-term, combined amount, gross $ 650       0  
Marine Terminal Revenue Refunding Bonds due 2031 at 1.78% – 4.80% during 2024 and 1.65% – 4.70% during 2023 | Variable Rate Debt Bonds            
Debt Instrument [Line Items]            
Long-term and short-term, combined amount, gross $ 265       $ 265  
Marine Terminal Revenue Refunding Bonds due 2031 at 1.78% – 4.80% during 2024 and 1.65% – 4.70% during 2023 | Variable Rate Debt Bonds | Minimum            
Debt Instrument [Line Items]            
Stated interest rate 1.78%       1.65%  
Marine Terminal Revenue Refunding Bonds due 2031 at 1.78% – 4.80% during 2024 and 1.65% – 4.70% during 2023 | Variable Rate Debt Bonds | Maximum            
Debt Instrument [Line Items]            
Stated interest rate 4.80%       4.70%  
Industrial Development Bonds due 2035 at 1.78% – 4.22% during 2024 and 1.85% – 4.70% during 2023 | Variable Rate Debt Bonds            
Debt Instrument [Line Items]            
Long-term and short-term, combined amount, gross $ 18       $ 18  
Industrial Development Bonds due 2035 at 1.78% – 4.22% during 2024 and 1.85% – 4.70% during 2023 | Variable Rate Debt Bonds | Minimum            
Debt Instrument [Line Items]            
Stated interest rate 1.78%       1.85%  
Industrial Development Bonds due 2035 at 1.78% – 4.22% during 2024 and 1.85% – 4.70% during 2023 | Variable Rate Debt Bonds | Maximum            
Debt Instrument [Line Items]            
Stated interest rate 4.22%       4.70%  
2.20% Revenue Refunding Bonds            
Debt Instrument [Line Items]            
Stated interest rate     2.20%      
Debt at face value     $ 200      
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 | Variable Rate Debt Bonds | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Stated interest rate 2.20%          
2.375% Revenue Refunding Bonds            
Debt Instrument [Line Items]            
Stated interest rate     2.375%      
Debt at face value     $ 200      
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 | Variable Rate Debt Bonds | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Stated interest rate 2.375%          
4.05% Revenue Refunding Bonds            
Debt Instrument [Line Items]            
Stated interest rate     4.05%      
Debt at face value     $ 200      
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 | Variable Rate Debt Bonds | Marathon Oil Corporation            
Debt Instrument [Line Items]            
Stated interest rate 4.05%          
3.30% Revenue Refunding Bonds | Variable Rate Debt Bonds            
Debt Instrument [Line Items]            
Stated interest rate 3.30%          
Long-term and short-term, combined amount, gross $ 400          
Revenue Refunding Bonds Due 2037 | Variable Rate Debt Bonds            
Debt Instrument [Line Items]            
Long-term and short-term, combined amount, gross 1,000       $ 0  
Other            
Debt Instrument [Line Items]            
Long-term and short-term, combined amount, gross $ 16       $ 21