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Commitments and Contingencies (Cont) (Details) $ in Millions			1 Months Ended				9 Months Ended
	May 29, 2015 USD ($) item	Jan. 03, 2013 USD ($) item	Nov. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Aug. 31, 2015 USD ($)	Oct. 31, 2007 subsidiary	Sep. 30, 2018 USD ($) plaintiff lawsuit installment subsidiary	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Nov. 28, 2017 USD ($)
7.00% Notes due June 2028
Other legal proceedings
Debt instrument interest rate stated percentage							7.00%
Macondo well incident
Contingencies
Amount of fines, recoveries and civil penalties							$ 217		$ 219
PSC Settlement Agreement
Contingencies
Settlement Agreement	$ 212
Number of classes of plaintiffs | item	2
Settlement allocated to Punitive Damage Class (as a percent)	72.80%
Settlement allocated to Assigned Claims Class (as a percent)	27.20%
Cash payment into an escrow account pending approval by MDL Court				$ 25	$ 212
Number of claimants | item	30
Payment of contingency accrual			$ 25
Number of installment | installment							3
Escrow Deposit							$ 214		$ 212
PSC Settlement Agreement Legal Fees
Contingencies
Settlement Agreement	$ 25
Plea Agreement
Contingencies
Number of misdemeanor count of negligently discharging oil | item		1
Amount paid for obligations under the Plea Agreement and Consent Decree including interest		$ 400						$ 60
Other legal proceedings
Number of subsidiaries | item		1
Asbestos litigation
Other legal proceedings
Number of claims | lawsuit							141
Number of subsidiaries | subsidiary							1
Asbestos litigation | LA
Other legal proceedings
Number of claims | plaintiff							9
Nigerian Cabotage Act litigation
Other legal proceedings
Number of subsidiaries | subsidiary						3
Percentage of surcharge on the value of contracts performed in Nigeria pursuant to the Coastal and Inland Shipping (Cabotage) Act 2003 (the Cabotage Act)						2.00%
Global Marine Litigation | 7.00% Notes due June 2028
Other legal proceedings
Debt instrument face value										$ 300
Debt instrument interest rate stated percentage										7.00%
Nigerian customer arbitration
Other legal proceedings
Uncertain collectability of drilling service receivable							$ 80
Hazardous waste disposal sites
Other legal proceedings
Number of subsidiaries | subsidiary							1
Percentage of liability for remediation and related costs							8.00%
Hazardous waste disposal sites | Minimum
Other legal proceedings
Minimum number of subsidiaries likely to be named potentially responsible party by US Environmental Protection Agency for superfund site (in counts) | subsidiary							1

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