Commitments and Contingencies (Details)	1 Months Ended	3 Months Ended	6 Months Ended
	Sep. 30, 2014 USD ($) number_of_paymentinstallments	Jun. 30, 2015 USD ($) Class_Actions	Jun. 30, 2015 USD ($) Class_Actions	Dec. 31, 2014 USD ($)	Apr. 22, 2010 USD ($) Fatalities
Loss Contingencies [Line Items]
Loss contingency related to Macondo well incident (non-current)		$ 439,000,000	$ 439,000,000	$ 439,000,000
Loss contingency related to MDL Settlement		733,000,000	733,000,000
Loss Contingency, Estimate of Possible Loss		72,000,000	72,000,000
Insurance Recoveries		93,000,000
Gain Contingency, Description		200,000,000	200,000,000
Loss Contingency, Estimated Recovery from Third Party		170,000,000	170,000,000
Loss contingency related to Macondo well (current)		367,000,000	367,000,000	$ 367,000,000
Loss Contingency, Information about Litigation Matters [Abstract]
Loss Contingency, Settlement Agreement, Terms	$ 1,100,000,000
Number of Payment Installments | number_of_paymentinstallments	3
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%
Number Of Years	2 years
Macondo well incident
Loss Contingencies [Line Items]
Loss contingency related to Macondo well (total)		805,000,000	805,000,000
Number of fatalities | Fatalities					11
Maximum per day fine for violating federal regulations related to INCs		35,000
Indemnification and insurance [Abstract]
Total amount of general liability insurance program					$ 600,000,000
Legal Fees			324,000,000
Legal fees and related expenses covered by insurance		$ 283,000,000	$ 283,000,000
Securities and related litigation
Loss Contingency, Information about Litigation Matters [Abstract]
Number of similar class action lawsuits that were later consolidated into one suit | Class_Actions		20	20