Commitments and Contingencies (Details)	1 Months Ended	12 Months Ended
	Sep. 30, 2014 USD ($)	Dec. 31, 2016 USD ($) Class_Actions	Dec. 31, 2015 USD ($) number_of_paymentinstallments	Apr. 22, 2010 USD ($) Fatalities
Loss Contingencies [Line Items]
Liabilities for Macondo well incident		$ 369,000,000	$ 400,000,000
Litigation [Abstract]
Payments for Legal Settlements		54,000,000
Loss Contingency Accrual, Payments	$ 1,100,000,000	33,000,000
Loss Contingency Accrual, Period Increase (Decrease)		(28,000,000)
Number of Payment Installments | number_of_paymentinstallments			3
Number Of Years	2 years
Installment Payment for Legal Fees | number_of_paymentinstallments			1
BP Fault Apportionment in Macondo Ruling			67.00%
Transocean Fault Apportionment In Macondo Ruling			30.00%
Halliburton Fault Apportionment In Macondo Ruling			3.00%
Indemnification and insurance [Abstract]
Litigation Settlement, Amount		100,000,000
Macondo well incident
Loss Contingencies [Line Items]
Number of fatalities | Fatalities				11
Liabilities for Macondo well incident		369,000,000
Loss Contingency, Accrual, Noncurrent		44,000,000
Maximum per day fine for violating federal regulations related to INCs		35,000
Litigation [Abstract]
Loss Contingency Accrual		413,000,000
Indemnification and insurance [Abstract]
Total amount of general liability insurance program				$ 600,000,000
Legal fees		1,500,000,000
General Liability Insurance Program Covered Expenses		409,000,000
Estimated Recovery from Third Party		$ 100,000,000
Securities and related litigation
Litigation [Abstract]
Number of similar class action lawsuits that were later consolidated into one suit | Class_Actions		20