Long-Lived Asset Impairments Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		11 Months Ended	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 13, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges					$ 20
Asset Write-Downs and Other Charges	$ 0			$ 91		$ 89	$ 38
Impairment Charge on Reclassified Assets					10
Long-Lived Asset Impairments	$ 0			$ 20		151	928
Tangible Asset Impairment Charges						141	923
Impairment of Intangible Assets (Excluding Goodwill)							5
Drilling Rigs [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges							740
Western Hemisphere [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges		$ 13					135
Impairment of Long-Lived Assets to be Disposed of						43
Impairment Charge on Reclassified Assets					3
Eastern Hemisphere [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges			$ 7				37
Impairment of Long-Lived Assets to be Disposed of						$ 98
Impairment Charge on Reclassified Assets					$ 7
Corporate, Non-Segment [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges							$ 11