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RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 - Reconciliation of Net Assets Available for Benefit (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
BP Employee Savings Plan (Plan No. 001)    
EBP, Reconciliation of Financial Statement to Form 5500 [Line Items]    
Net assets available for benefits as stated in the financial statements $ 9,080,058 $ 8,279,147
Adjustment from contract value to fair value for fully benefit responsive investment contracts (7,396) (15,484)
Net assets available for benefits as stated in the Form 5500 9,072,662 8,263,663
BP Partnership Savings Plan (Plan No. 051)    
EBP, Reconciliation of Financial Statement to Form 5500 [Line Items]    
Net assets available for benefits as stated in the financial statements 43,638 36,704
Adjustment from contract value to fair value for fully benefit responsive investment contracts (28) (66)
Net assets available for benefits as stated in the Form 5500 43,610 36,638
BP DirectSave Plan (Plan No. 052)    
EBP, Reconciliation of Financial Statement to Form 5500 [Line Items]    
Net assets available for benefits as stated in the financial statements 40,197 37,965
Adjustment from contract value to fair value for fully benefit responsive investment contracts (31) (60)
Net assets available for benefits as stated in the Form 5500 40,166 37,905
BPX Energy Employee Savings Plan (Plan No. 100)    
EBP, Reconciliation of Financial Statement to Form 5500 [Line Items]    
Net assets available for benefits as stated in the financial statements 444,871 366,524
Adjustment from contract value to fair value for fully benefit responsive investment contracts (120) (201)
Net assets available for benefits as stated in the Form 5500 444,751 366,323
Archaea Employee Savings Plan (Plan No. 101)    
EBP, Reconciliation of Financial Statement to Form 5500 [Line Items]    
Net assets available for benefits as stated in the financial statements 48,382 34,568
Adjustment from contract value to fair value for fully benefit responsive investment contracts (27) (68)
Net assets available for benefits as stated in the Form 5500 $ 48,355 $ 34,500