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Stock-Based Compensation - General Employees Stock Purchase Plan (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amounts recognized in the financial statements |  |  |
Compensation expense | $ 274 | $ 263 | $ 274
Employee Stock |  |  |
Amounts recognized in the financial statements |  |  |
Number of shares authorized (in shares) | 60 |  |
Option price, percentage of market value at date of grant (as a percent) | 85.00% |  |
Weighted-average fair value (in dollars per share) | $ 15.77 | $ 21.20 | $ 27.80
Option price, discount from market value at date of grant (as a percent) | 15.00% |  |
Compensation expense | $ 21 | $ 31 | $ 32

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- Definition The percentage of the market value at which employee stock purchase plan participants are entitled to purchase stock under the plan. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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