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Price Risk Management Activities, Effect of Derivative Instruments on Income and Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Effect of Derivative Instruments on Income (Textual)
Estimated deferred after-tax loss expected to be reclassified into income over next 12 months			$ 3
Commodity Contracts [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in other comprehensive income (loss) on derivatives	$ (5)	$ 4	50	$ 4
Commodity Contracts [Member] \| Revenues [Member]
Effect of Derivative Instruments on Income
Gain (loss) reclassified from accumulated other comprehensive income (loss) into income	19	(2)	45	(2)
Commodity Contracts [Member] \| Revenues [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in income on derivatives	9	5	1	5
Commodity Contracts [Member] \| Cost of Materials and Other [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in income on derivatives	140	72	(12)	1
Commodity Contracts [Member] \| Operating Expenses (Excluding Depreciation and Amortization Expense) [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in income on derivatives	4	0	2	0
Foreign Currency Contracts [Member] \| Cost of Materials and Other [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in income on derivatives	0	2	49	(7)
Foreign Currency Contracts [Member] \| Other Income, Net [Member] \| Derivatives Not Designated as Hedging Instruments [Member]
Effect of Derivative Instruments on Income
Gain (loss) recognized in income on derivatives	$ 60	$ 48	$ (105)	$ 55