Suspended Wells and Exploration Expenses (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Suspended Wells and Exploration Expenses [Abstract]
Exploration expenses	$ 344	$ 1,457	$ 743
Impaired Assets To Be Disposed Of By Method Other Than Sale [Line Items]
Exploration Expense	$ 344	1,457	743
Alaska [Member]
Suspended Wells and Exploration Expenses [Abstract]
Exploration expenses		828
Impaired Assets To Be Disposed Of By Method Other Than Sale [Line Items]
Exploration Expense		828
Other International [Member]
Suspended Wells and Exploration Expenses [Abstract]
Exploration expenses		84
Impaired Assets To Be Disposed Of By Method Other Than Sale [Line Items]
Exploration Expense		84
Asia Pacific [Member]
Suspended Wells and Exploration Expenses [Abstract]
Exploration expenses		50
Impaired Assets To Be Disposed Of By Method Other Than Sale [Line Items]
Exploration Expense		$ 50
Lower 48 [Member]
Suspended Wells and Exploration Expenses [Abstract]
Exploration expenses			141
Impaired Assets To Be Disposed Of By Method Other Than Sale [Line Items]
Exploration Expense			141
Lower 48 [Member] | Central Louisiana Austin Chalk [Member]
Suspended Wells and Exploration Expenses [Abstract]
Exploration expenses			111
Impaired Assets To Be Disposed Of By Method Other Than Sale [Line Items]
Exploration Expense			$ 111