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Share-Based Compensation (Summary of Employee Stock Purchase Plan) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share based compensation expense | $ 106 | $ 90 | $ 87
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares purchased (in shares) | 591,820 | 605,274 | 663,369
Weighted-average price of shares purchased (in dollars per share) | $ 43.54 | $ 41.41 | $ 31.93
Share based compensation expense | $ 8 | $ 7 | $ 5

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- Definition Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement. + 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 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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