Financial Risk Management Activities - Credit Risk - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Letters of credit - outstanding amount	$ 85	$ 88
Integrated Companies
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	42.00%
Independent E&P Companies
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	36.00%
Refining & Marketing Companies
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	12.00%
Storage & Transportation Companies
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	3.00%
National Oil Companies
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	2.00%
Others
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	5.00%