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Stock-Based Compensation (Tables)
12 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount
The following table summarizes stock-based compensation related charges and benefits (in millions):

Year Ended September 30,
202320222021
Compensation expense$101 $104 $97 
Income tax benefit resulting from share-based compensation arrangements25 26 24 
Tax impact from exercise and vesting of equity settled awards12 12 
Summary of Nonvested Restricted Stock Awards
A summary of non-vested restricted stock awards at September 30, 2023, and changes for the year then ended, is presented below:
Weighted
Average
Price
Shares/Units
Subject to
Restriction
Non-vested, September 30, 2022$58.78 2,949,194 
Granted65.72 2,010,495 
Vested53.55 (1,487,685)
Forfeited64.14 (664,891)
Non-vested, September 30, 2023$64.90 2,807,113 
Schedule of Share-Based Payment Award, Performance Share, Valuation Assumptions
The following table summarizes the assumptions used in determining the fair value of stock options granted:
 Year Ended September 30,
 202320222021
Risk-free interest rate4.04%0.99%0.20%
Expected volatility of the Company’s stock33.50%30.00%30.90%
Summary of Nonvested PSUs
A summary of the status of the Company’s non-vested PSU's at September 30, 2023, and changes for the year then ended, is presented below:
Weighted
Average
Price
Shares/Units
Subject to
PSU
Non-vested, September 30, 2022$60.30 1,143,071 
Granted79.45 344,029 
Vested43.19 (361,117)
Forfeited71.18 (258,459)
Non-vested, September 30, 2023$71.77 867,524 
Assumptions Used in Black-Scholes Option Valuation Model
The following table summarizes the assumptions used in determining the fair value of stock options granted:
 Year Ended September 30,
 202320222021
Expected life of option (years)5.86.06.5
Risk-free interest rate3.59%1.35%0.60%
Expected volatility of the Company’s stock29.40%27.80%27.60%
Expected dividend yield on the Company’s stock2.10%1.71%2.28%
Summary of Stock Option Activity
A summary of stock option activity at September 30, 2023, and changes for the year then ended, is presented below:
Weighted
Average
Option Price
Shares
Subject to
Option
Weighted
Average
Remaining
Contractual
Life (years)
Aggregate
Intrinsic
Value
(in millions)
Outstanding, September 30, 2022$42.46 5,683,847 
Granted66.77 570,140 
Exercised38.17 (1,068,612)
Forfeited or expired59.31 (265,459)
Outstanding, September 30, 2023$45.44 4,919,916 5.75$56 
Exercisable, September 30, 2023$39.11 3,762,092 3.83$53 
The following table summarizes additional stock option information:
Year Ended September 30,
202320222021
Weighted-average grant-date fair value of options granted$18.21 $18.59 $9.36 
Intrinsic value of options exercised (in millions)27 19 94