Suspended Wells and Exploration Expenses (Aging of Exploratory Well Cost, Capitalized for More than One Year) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	$ 656	$ 526	$ 814
Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	433
Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	81
Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	142
Willow - Alaska [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	313
Willow - Alaska [Member] | Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	262
Willow - Alaska [Member] | Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	51
Willow - Alaska [Member] | Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
Surmont - Canada [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	121
Surmont - Canada [Member] | Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	2
Surmont - Canada [Member] | Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	19
Surmont - Canada [Member] | Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	100
PL 1009 - Norway [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	43
PL 1009 - Norway [Member] | Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	43
PL 1009 - Norway [Member] | Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
PL 1009 - Norway [Member] | Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
PL 891 - Norway [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	34
PL 891 - Norway [Member] | Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	34
PL 891 - Norway [Member] | Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
PL 891 - Norway [Member] | Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
Narwhal Trend - Alaska [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	25
Narwhal Trend - Alaska [Member] | Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	25
Narwhal Trend - Alaska [Member] | Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
Narwhal Trend - Alaska [Member] | Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
WL4-00 - Malaysia( [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	24
WL4-00 - Malaysia( [Member] | Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	24
WL4-00 - Malaysia( [Member] | Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
WL4-00 - Malaysia( [Member] | Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
PL782S - Norway [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	22
PL782S - Norway [Member] | Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	22
PL782S - Norway [Member] | Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
PL782S - Norway [Member] | Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
NC 98 - Libya [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	13
NC 98 - Libya [Member] | Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
NC 98 - Libya [Member] | Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
NC 98 - Libya [Member] | Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	13
Other of $10 Million or less each [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	61
Other of $10 Million or less each [Member] | Suspended Since 2018-2020 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	21
Other of $10 Million or less each [Member] | Suspended Since 2015-2017 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	11
Other of $10 Million or less each [Member] | Suspended Since 2004-2014 [Member]
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	$ 29