v3.26.1
Financial instruments related to commodity contracts - Offsetting of financial assets and financial liabilities (Details) - Derivative financial instruments related to commodity contracts - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets $ 6,022 $ 9,331 $ 7,565  
Gross value before offsetting - liabilities (4,707) (7,939) (8,203)  
Amounts offset - assets (312) (259) (553)  
Amounts offset - liabilities 312 259 553  
Net balance sheet value presented - assets 5,710 9,072 7,012  
Net balance sheet value presented - liabilities (4,395) (7,680) (7,650)  
Other amounts not offset - collateral pledged 123 403 109  
Net carrying amount after other amounts not offset 1,438 1,795 (529)  
Fair value 1,315 1,392 (638)  
Fair value after other amounts not offset 1,438 1,795 (529)  
Gas & Power activities        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets 4,759 8,454 6,533  
Gross value before offsetting - liabilities (3,029) (6,724) (6,494)  
Amounts offset - assets (202) (86) (280)  
Amounts offset - liabilities 202 86 280  
Net balance sheet value presented - assets 4,557 8,368 6,253  
Net balance sheet value presented - liabilities (2,827) (6,638) (6,214)  
Other amounts not offset - collateral pledged 123 403 109  
Net carrying amount after other amounts not offset 1,853 2,133 148  
Fair value 1,730 1,730 39 $ 2,347
Fair value after other amounts not offset 1,853 2,133 148  
Gas & Power activities | Swaps        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets 304 117 116  
Gross value before offsetting - liabilities (329) (129) (125)  
Amounts offset - assets (108) (7) (27)  
Amounts offset - liabilities 108 7 27  
Net balance sheet value presented - assets 196 110 89  
Net balance sheet value presented - liabilities (221) (122) (98)  
Net carrying amount (25) (12) (9)  
Fair value (25) (12) (9)  
Gas & Power activities | Forwards        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets 4,326 8,060 5,875  
Gross value before offsetting - liabilities (2,692) (6,595) (6,369)  
Amounts offset - assets (94) (79) (253)  
Amounts offset - liabilities 94 79 253  
Net balance sheet value presented - assets 4,232 7,981 5,622  
Net balance sheet value presented - liabilities (2,598) (6,516) (6,116)  
Net carrying amount 1,634 1,465 (494)  
Fair value 1,634 1,465 (494)  
Gas & Power activities | Options        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets 129 277 540  
Gross value before offsetting - liabilities (8)      
Net balance sheet value presented - assets 129 277 540  
Net balance sheet value presented - liabilities (8)      
Net carrying amount 121 277 540  
Fair value 121 277 540  
Gas & Power activities | Futures        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets     2  
Net balance sheet value presented - assets     2  
Net carrying amount     2  
Fair value     2  
Crude oil, petroleum products and freight rates activities        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets 1,263 877 1,032  
Gross value before offsetting - liabilities (1,678) (1,215) (1,709)  
Amounts offset - assets (110) (173) (273)  
Amounts offset - liabilities 110 173 273  
Net balance sheet value presented - assets 1,153 704 759  
Net balance sheet value presented - liabilities (1,568) (1,042) (1,436)  
Net carrying amount after other amounts not offset (415) (338) (677)  
Fair value (415) (338) (677) $ (901)
Fair value after other amounts not offset $ (415) (338) (677)  
Maximum maturity of most derivatives 1 year      
Crude oil, petroleum products and freight rates activities | Swaps        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets $ 87 85 66  
Gross value before offsetting - liabilities (53) (46) (50)  
Amounts offset - assets (33) (44) (28)  
Amounts offset - liabilities 33 44 28  
Net balance sheet value presented - assets 54 41 38  
Net balance sheet value presented - liabilities (20) (2) (22)  
Net carrying amount 34 39 16  
Fair value 34 39 16  
Crude oil, petroleum products and freight rates activities | Forwards        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets 1,061 656 655  
Gross value before offsetting - liabilities (1,389) (1,012) (1,348)  
Amounts offset - assets (1) (14) (13)  
Amounts offset - liabilities 1 14 13  
Net balance sheet value presented - assets 1,060 642 642  
Net balance sheet value presented - liabilities (1,388) (998) (1,335)  
Net carrying amount (328) (356) (693)  
Fair value (328) (356) (693)  
Crude oil, petroleum products and freight rates activities | Options        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets 55 70 23  
Gross value before offsetting - liabilities (202) (102) (97)  
Amounts offset - assets (42) (60) (23)  
Amounts offset - liabilities 42 60 23  
Net balance sheet value presented - assets 13 10    
Net balance sheet value presented - liabilities (160) (42) (74)  
Net carrying amount (147) (32) (74)  
Fair value (147) (32) (74)  
Crude oil, petroleum products and freight rates activities | Futures        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets     1  
Net balance sheet value presented - assets     1  
Net carrying amount     1  
Fair value     1  
Crude oil, petroleum products and freight rates activities | Options on futures        
Financial structure, financial costs and financial instruments        
Gross value before offsetting - assets 60 66 287  
Gross value before offsetting - liabilities (34) (55) (214)  
Amounts offset - assets (34) (55) (209)  
Amounts offset - liabilities 34 55 209  
Net balance sheet value presented - assets 26 11 78  
Net balance sheet value presented - liabilities     (5)  
Net carrying amount 26 11 73  
Fair value $ 26 $ 11 $ 73