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Equity - Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Share-based compensation |  |  |
Options granted (in shares) | 178 | 197 |
Assumptions used to measure the fair value of awards |  |  |
Expected life (in years) | 5 years 6 months | 5 years 6 months |
Risk-free interest rate | 4.20% | 4.00% |
Expected volatility | 28.10% | 28.30% |
Expected dividend yield | 2.90% | 2.90% |
Stock options, Number of Options |  |  |
Outstanding at the beginning of the period (in shares) | 1,953 |  |
Granted (in shares) | 178 | 197 |
Exercised (in shares) | (165) |  |
Cancelled (in shares) | (21) |  |
Outstanding at the end of the period (in shares) | 1,945 |  | 1,953
Exercisable at the end of the period (in shares) | 1,573 |  |
Stock options, Weighted Average Exercise Price per Share |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 96.61 |  |
Granted (in dollars per share) | 108.38 |  |
Exercised (in dollars per share) | 79.87 |  |
Cancelled (in dollars per share) | 103.69 |  |
Outstanding at the end of the period (in dollars per share) | 99.03 |  | $ 96.61
Exercisable at the end of the period (in dollars per share) | $ 98.53 |  |
Additional information pertaining to stock options |  |  |
Average Remaining Contractual Term, Outstanding | 5 years 5 months 8 days |  | 4 years 11 months 19 days
Average Remaining Contractual Term, Exercisable | 4 years 6 months 21 days |  |
Aggregate Intrinsic Value, Outstanding (in dollars) | $ 38 |  | $ 29
Aggregate Intrinsic Value, Exercisable (in dollars) | 32 |  |
Cash received from exercise of stock options | $ 13 |  |
Weighted average grant date fair value of stock options granted (in dollars per share) | $ 26.33 | $ 23.80 |
Total intrinsic value of stock options exercised (in dollars) | $ 5 | $ 6 |
Stock options |  |  |
Share-based compensation |  |  |
Term of award | 10 years |  |
Period of vesting | 3 years |  |
Additional information pertaining to stock options |  |  |
Unrecognized compensation cost | $ 6 |  |
Weighted-average period for amortization of unrecognized compensation cost | 1 year 6 months |  |

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