Fair Value Measurement - Unobservable inputs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other Assets, Current	$ 529	$ 523
Other Assets, Noncurrent	1,445	1,460
Gulf of Mexico Contingent Consideration
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at January 1, 2022	81
Net unrealized loss related to assets still held at the end of the period	(1)
Settlements	(6)
Fair value at March 31, 2022	74
Deepwater Gulf of Mexico Interests | Freeport-McMoRan Oil & Gas
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Contingent Receivable			$ 150
Other Assets, Current	20	20
Other Assets, Noncurrent	$ 64	$ 70