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Stock Plans - Performance Share Units and Other Stock-Based Awards Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Number of Shares    
Beginning balance (in shares)   4,451,674
Shares granted (in shares)   2,202,361
Vested (in shares) [1],[2]   (1,658,391)
Forfeited (in shares) [1]   (247,953)
Ending balance (in shares) 4,747,691 4,747,691
Weighted-average grant date fair value per share    
Beginning balance (in dollars per share) [3]   $ 60.12
Shares granted (in dollars per share) [3]   66.79
Vested (in dollars per share) [1],[2],[3]   62.71
Forfeited (in dollars per share) [1],[3]   62.58
Ending balance (in dollars per share) [3] $ 62.18 $ 62.18
Weighted-Average Aggregate Fair Value    
Weighted average grant date fair value of shares granted [2]   $ 147
Weighted average grant date fair value of shares vested [1],[2]   104
Actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the shares vested $ 0 $ 2
Performance share units    
Number of Shares    
Shares granted (in shares)   895,410
Weighted-average grant date fair value per share    
Shares granted (in dollars per share) [3]   $ 68.59
Deferred stock units    
Number of Shares    
Shares granted (in shares)   578,570
Weighted-average grant date fair value per share    
Shares granted (in dollars per share) [3]   $ 65.36
Additional shares granted    
Number of Shares    
Shares granted (in shares) [4]   728,381
Weighted-average grant date fair value per share    
Shares granted (in dollars per share) [3],[4]   $ 65.73
[1] Includes PSUs, DSUs and other stock-based awards.
[2] The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the shares vested totaled zero in the three months and $2 million in the nine months ended September 30, 2023.
[3] The grant date fair value of PSUs is determined based on the Monte Carlo simulation model for the market-based total shareholder return component and the closing market price of the Company’s stock on the grant date for performance-based components. The Monte Carlo simulation model incorporates the probability of achieving the total shareholder return market condition. Compensation expense is recognized using the grant date fair values regardless of whether the market condition is achieved, so long as the requisite service has been provided.
[4] Includes PSUs and DSUs.