Commitments and Contingencies (Environmental) (Details)	1 Months Ended	12 Months Ended
	Sep. 30, 2014 USD ($)	Dec. 31, 2016 USD ($) Superfund_Sites	Dec. 31, 2015 USD ($) number_of_paymentinstallments	Apr. 22, 2010 USD ($) Fatalities
Site Contingency [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)		$ (28,000,000)
BP Fault Apportionment in Macondo Ruling			67.00%
Transocean Fault Apportionment In Macondo Ruling			30.00%
Halliburton Fault Apportionment In Macondo Ruling			3.00%
Installment Payment for Legal Fees | number_of_paymentinstallments			1
Loss Contingency Accrual, Payments	$ 1,100,000,000	33,000,000
Number of Payment Installments | number_of_paymentinstallments			3
Number Of Years	2 years
Liabilities for Macondo well incident		369,000,000	$ 400,000,000
Accrual for Environmental Loss Contingencies Disclosure [Abstract]
Accrued liabilities for environmental matters		$ 50,000,000
Superfund Sites [Member]
Accrual for Environmental Loss Contingencies Disclosure [Abstract]
Number of superfund sites | Superfund_Sites		8
Accrual for site contingency		$ 5,000,000
Damage from Fire, Explosion or Other Hazard [Member]
Site Contingency [Line Items]
Number Of Fatalities | Fatalities				11
Maximum Per Day Fine For Violating Federal Regulations Related To Incs		35,000
Loss Contingency Accrual		413,000,000
Liabilities for Macondo well incident		369,000,000
Loss Contingency, Accrual, Noncurrent		44,000,000
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