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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Amounts recognized in the financial statements |  |  |
Compensation expense | $ 268 | $ 241 | $ 234
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) | $ 16.76 | $ 15.77 | $ 21.20
Option price, discount from market value at date of grant (as a percent) | 15.00% |  |
Compensation expense | $ 12 | $ 21 | $ 31

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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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