Acquisitions and Divestitures (Schedule of Divestiture-related Charges) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Restructuring Charges		$ 159	$ 0	$ 0
Asset divestiture-related charges		25	170	0
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning employee-related obligations		27	0
Restructuring Charges		155	39
Cash payments		(176)	(12)
Ending employee-related obligations	$ 6	6	27	0
Restructuring Reserve	6	27	$ 27	$ 0
Employee Severance [Member] \| South Texas divestiture
Restructuring Reserve [Roll Forward]
Asset divestiture-related charges	$ 19
Employee Severance [Member] \| Corporate Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		$ 133

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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