Acquisitions and Divestitures (Schedule of Divestiture-related Charges) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Ending employee-related obligations	$ 138
Total divestiture-related and decommissioning-related obligations	138	$ 138
Employee-related charges:
Restructuring Reserve [Roll Forward]
Beginning employee-related obligations	0
Additions	39
Cash payments	(12)
Ending employee-related obligations	27
Total divestiture-related and decommissioning-related obligations	0	27
Contract termination charges:
Restructuring Reserve [Roll Forward]
Beginning employee-related obligations	0
Additions	124
Cash payments	(13)
Ending employee-related obligations	111
Total divestiture-related and decommissioning-related obligations	0	111
Firm transportation contracts
Restructuring Reserve [Roll Forward]
Ending employee-related obligations	98
Total divestiture-related and decommissioning-related obligations	98	98
2019		42
2020		$ 44
2021	$ 12

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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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