Divestiture, Decommissioning and Restructuring Activities (Schedule of Restructuring and Employee Related Costs) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Divestiture related liabilities	$ 128
Firm Transportation Contracts [Member]
Restructuring Cost and Reserve [Line Items]
Divestiture related liabilities		$ 90
Divestiture related liabilities, current		30
Restructuring Reserve, Year Two		43
Restructuring Reserve, Year Three		17
Employee severance
Restructuring Cost and Reserve [Line Items]
Divestiture related liabilities	26	27
Restructuring Charges	13
Payments for Restructuring	(10)
Noncash changes (Note 8)	(4)
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Divestiture related liabilities	102	$ 111
Payments for Restructuring	$ (9)

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Restructuring Reserve, Year Two

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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