v3.26.3
Risk Management - CF Hedging Effect on the Income Statements (Details) - Designated as Hedging Instrument - Cash flow hedge - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Gain/(loss) recognized in OCI on derivative $ (189) $ 29 $ (395) $ 189
Gain/(loss) reclassified from Accumulated OCI into income (50) 13 (142) 78
Gain/(loss) to be reclassified within twelve months     (101)  
Energy commodity derivative contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain/(loss) recognized in OCI on derivative (185) 32 (378) 122
Energy commodity derivative contracts | Statement of Income Location Balance [Axis]: us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain/(loss) reclassified from Accumulated OCI into income 0 (1) 0 (2)
Energy commodity derivative contracts | Statement of Income Location Balance [Axis]: us-gaap:Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain/(loss) reclassified from Accumulated OCI into income (45) 17 (121) 11
Foreign currency contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain/(loss) recognized in OCI on derivative (4) (3) (17) 67
Foreign currency contracts | Statement of Income Location Balance [Axis]: us-gaap:OtherNonoperatingIncomeExpense        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain/(loss) reclassified from Accumulated OCI into income $ (5) $ (3) $ (21) $ 69