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Share-Based Compensation (Schedule of Aggregate Fair Value of Restricted Stock, Performance-Based Restricted Stock And Performance Shares, Awards And Units, That Vested During The Period) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Awards And Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value of awards and units, vested	$ 115	$ 44	$ 127
Performance-Based Restricted Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value of awards and units, vested	1	2	4
Performance Share Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value of awards and units, vested	$ 15	$ 10	$ 4

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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