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Stock-Based Compensation (Activity Relating to Performance Share Awards) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Compensation Expense Recorded [Line Items] |  |  |
Compensation expense | $ 48 | $ 62 | $ 71
Performance Share Awards |  |  |
Compensation Expense Recorded [Line Items] |  |  |
Weighted grant date fair value of awards granted (in dollars per share) | $ 112.73 | $ 120.25 | $ 118.43
Awards settled in cash | $ 9 | $ 10 | $ 12
Awards settled in stock | 59 | 72 | 74
Compensation expense | $ 34 | $ 47 | $ 58

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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