Financial Risk Management Activities - Credit Risk - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Letters of credit - outstanding amount	$ 88	$ 83
Integrated Companies
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	40.00%
Independent E&P Companies
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	37.00%
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	4.00%
National Oil Companies
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	1.00%
Others
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration percentage of accounts receivable	6.00%