Long-Lived Asset Impairments (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2021	Dec. 31, 2020
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment	$ 0	$ 20	$ 0	$ 814
Property, Plant and Equipment			571
Intangible Assets			155
Right of Use Assets			88
Long-lived Asset Impairments		$ 20
Corporate and Other
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment			18
Property, Plant and Equipment			18
Intangible Assets			0
Right of Use Assets			0
Drilling and Evaluation
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment			285
Property, Plant and Equipment			195
Intangible Assets			76
Right of Use Assets			14
Well Construction and Completions
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment			185
Property, Plant and Equipment			126
Intangible Assets			39
Right of Use Assets			20
Production and Intervention
Impaired Long-Lived Assets Held and Used [Line Items]
Long-lived Assets Impairment			326
Property, Plant and Equipment			232
Intangible Assets			40
Right of Use Assets			$ 54