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Debt And Related Expenses (Schedule of Net Financing Cost Components) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Disclosure [Abstract]
Interest based on debt outstanding	$ 98	$ 65	$ 203	$ 130
Gain on early retirement of debt	(10)		(30)
Interest income		(2)	(1)	(7)
Other	(8)	6	(15)	11
Total net financing costs	$ 80	$ 69	$ 157	$ 134

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Net financing costs other.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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