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Debt Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	May 21, 2018	May 20, 2018
Short Term Debt [Line Items]
Commercial Paper Program, Amount Outstanding				$ 275
Debt Instrument [Line Items]
Repayments of Debt				4,970	$ 6,594
Revolving Credit Facility [Member]
Short Term Debt [Line Items]
Maximum borrowing capactiy under revolving credit facility						$ 6,000	$ 6,750
Remaining borrowing capacity under revolving credit facility				6,000
Letter of Credit [Member]
Short Term Debt [Line Items]
Commercial Paper Program, Amount Outstanding				0
Minimum Limit of Debt for Cross Default Provision				200
Letter of Credit [Member] | Maximum [Member]
Short Term Debt [Line Items]
Maximum borrowing capactiy under revolving credit facility				500
Commercial Paper [Member]
Short Term Debt [Line Items]
Commercial Paper Program, Amount Outstanding				0
Unsecured Debt [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 1,800	$ 2,650
Premiums paid above book value to redeem debt			$ 208
Unsecured Debt [Member] | 9.125% Debentures [Member] | Due 2021 [Member]
Debt Instrument [Line Items]
Repayments of Debt		27
Unsecured Debt [Member] | 2.2% Notes [Member] | Due 2020 [Member]
Debt Instrument [Line Items]
Repayments of Debt		500
Unsecured Debt [Member] | 4.2% Notes [Member] | Due 2021 [Member]
Debt Instrument [Line Items]
Repayments of Debt		1,000
Unsecured Debt [Member] | 2.875% Notes [Member] | Due 2021 [Member]
Debt Instrument [Line Items]
Repayments of Debt		750
Unsecured Debt [Member] | 8.20% Debentures [Member] | Due 2025 [Member]
Debt Instrument [Line Items]
Repayments of Debt		16
Unsecured Debt [Member] | 8.125% Notes [Member] | Due 2030 [Member]
Debt Instrument [Line Items]
Repayments of Debt		210
Unsecured Debt [Member] | 7.9% Debentures [Member] | Due 2047 [Member]
Debt Instrument [Line Items]
Repayments of Debt		40
Unsecured Debt [Member] | 7.65% Debentures [Member] | Due 2023 [Member]
Debt Instrument [Line Items]
Repayments of Debt		10
Unsecured Debt [Member] | 7.8% Debentures [Member] | Due 2027 [Member]
Debt Instrument [Line Items]
Repayments of Debt		$ 97
Unsecured Debt [Member] | 2.4% Notes [Member] | Due 2022 [Member]
Debt Instrument [Line Items]
Repayments of Debt	671
Unsecured Debt [Member] | 3.35% Notes [Member] | Due 2024 [Member]
Debt Instrument [Line Items]
Repayments of Debt	574
Unsecured Debt [Member] | 3.35% Notes [Member] | Due 2025 [Member]
Debt Instrument [Line Items]
Repayments of Debt	301
Unsecured Debt [Member] | 4.15 % Notes [Member] | Due 2034 [Member]
Debt Instrument [Line Items]
Repayments of Debt	254
VRDB [Member]
Debt Instrument [Line Items]
Debt Instrument Face Amount				$ 283
Floating Rate Notes [Member] | Floating rate note due 2018 [Member] | Due 2018 [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 250
ConocoPhillips Commercial Paper Program [Member] | Commercial Paper [Member]
Short Term Debt [Line Items]
Maturity period of commercial paper (in days)				90
Commercial Paper Program, Capacity				$ 6,000
Commercial Paper Program, Amount Outstanding				$ 0

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