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Derivative and Financial Instruments (Narrative - Foreign Currency Exchange) (Details)
$ in Millions, $ in Billions
12 Months Ended
Dec. 31, 2021
AUD ($)
Dec. 31, 2020
CAD ($)
Derivative [Line Items]    
Description of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Activities At December 31, 2021, we had outstanding foreign currency exchange forward contracts to buy $1.9 billion AUD at $0.715 AUD against the U.S. dollar in anticipation of our future acquisition of an additional interest in APLNG. At December 31, 2020, we had outstanding foreign currency exchange forward contracts to sell $0.45 billion CAD at $0.748 CAD against the U.S. dollar  
Foreign Exchange Forward [Member] | Nondesignated [Member]    
Derivative [Line Items]    
Derivative, Forward Exchange Rate 0.715 0.748
Net notional position of foreign currency exchange derivatives $ 1.9 $ 450