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Contingencies and Commitments (Details) - USD ($)	1 Months Ended				3 Months Ended		9 Months Ended
	Aug. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Feb. 28, 2017	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018	Apr. 13, 2018	Dec. 31, 2017	Dec. 01, 2017
Loss Contingencies [Line Items]
Loss Contingency, Settlement Agreement, Terms							30 years
Letters of Credit Outstanding, Amount					$ 275,000,000		$ 275,000,000
Burlington Resources Inc Vs The Republic Of Ecuador [Member]
Loss Contingencies [Line Items]
Cash Proceeds from Legal Settlements						$ 262,000,000
Conoco Phillips Vs Petroleos de Venezuela SA [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party			$ 2,000,000,000
Initial Litigation Settlement Amount Awarded From Other Party		$ 1,930,000,000
Total Proceeds From Legal Settlement					345,000,000
Cash Proceeds from Legal Settlements					103,000,000
Inventory Received For Settlement					242,000,000
Initial Settlement Agreement Payment Terms							90 days from the timing of signing
Remaining Settlement Agreement Payment Terms							paid quarterly over a period of four and a half years
Initial Payment received related to legal settlement	$ 500,000,000
ECUADOR | Burlington Resources Inc Vs The Republic Of Ecuador [Member] | Burlington Resources, Inc [Member]
Loss Contingencies [Line Items]
Litigation Settlement Amount Awarded To Other Party				$ 380,000,000
Litigation Settlement, Amount Awarded from Other Party				42,000,000
Settlement Amount Awarded To Other Party Through Third Party									$ 337,000,000
Settlement Amount Received By Other Party								$ 262,000,000		$ 75,000,000
Offset For Counter Claim				$ 24,000,000
U.S. and Canada | Cleanup Remediation Activities [Member]
Loss Contingencies [Line Items]
Total environmental accrual included in balance sheet					$ 170,000,000		$ 170,000,000		$ 180,000,000

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