Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Significant Purchase and Supply Commitments [Line Items]
2014	$ 604
2015	466
2016	365
2017	263
2018	252
2019 and Thereafter	1,089
Total	3,039
Rental Expense for office buildings and oil and gas operations equipment	50		37	31
Drilling Equipment And Purchase Commitments [Member]
Significant Purchase and Supply Commitments [Line Items]
2014	394
2015	201
2016	103
2017	2
2018	0
2019 and Thereafter	0
Total	700
Transportation Agreement Commitments [Member]
Significant Purchase and Supply Commitments [Line Items]
2014	91
2015	134
2016	135
2017	134
2018	133
2019 and Thereafter	465
Total	1,092
Operating Lease Commitments [Member]
Significant Purchase and Supply Commitments [Line Items]
2014	42
2015	49
2016	61
2017	61
2018	53
2019 and Thereafter	400
Total	666
Fpso Lease Commitments [Member]
Significant Purchase and Supply Commitments [Line Items]
2014	77	[1]
2015	82	[1]
2016	66	[1]
2017	66	[1]
2018	66	[1]
2019 and Thereafter	224	[1]
Total	$ 581	[1]

[1] Annual lease payments, net to our interest, exclude regular maintenance and operational costs. See Note 10. Long-Term Debt.