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Stock-Based Compensation (Schedule of Unrecognized Compensation Costs and Amortization Periods) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Stock options	$ 8
Weighted-Average Service Years	1 year 1 month 6 days
Restricted share units
Share-based Compensation Arrangement by Share-based Payment Award
Total remaining unrecognized compensation costs, nonvested awards other than options	$ 27
Weighted-Average Service Years	1 year 8 months 12 days
Performance-based restricted share units
Share-based Compensation Arrangement by Share-based Payment Award
Total remaining unrecognized compensation costs, nonvested awards other than options	$ 32
Weighted-Average Service Years	1 year 8 months 12 days

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ 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
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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