Suspended Wells and Exploration Expenses - Aging of Exploratory Well Cost, Capitalized for More than One Year (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	$ 133	$ 163	$ 184
2021-2024
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	11
2018-2020
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	94
2017 and Prior
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	28
PL 891 - Norway
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	31
PL 891 - Norway \| 2021-2024
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
PL 891 - Norway \| 2018-2020
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	31
PL 891 - Norway \| 2017 and Prior
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
West Willow - Alaska
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	30
West Willow - Alaska \| 2021-2024
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
West Willow - Alaska \| 2018-2020
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	30
West Willow - Alaska \| 2017 and Prior
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
Narwhal Trend - Alaska
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	25
Narwhal Trend - Alaska \| 2021-2024
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
Narwhal Trend - Alaska \| 2018-2020
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	25
Narwhal Trend - Alaska \| 2017 and Prior
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
Montney - Canada
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	15
Montney - Canada \| 2021-2024
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	7
Montney - Canada \| 2018-2020
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	8
Montney - Canada \| 2017 and Prior
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
Other of $10 Million or less each
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	32
Other of $10 Million or less each \| 2021-2024
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	4
Other of $10 Million or less each \| 2018-2020
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	0
Other of $10 Million or less each \| 2017 and Prior
Capitalized Exploratory Well Costs [Line Items]
Exploratory well costs capitalized for a period greater than one year	$ 28