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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Number of Shares    
Balance at January 1, 2023 (in shares)   4,451,674
Shares granted (in shares)   2,184,613
Vested (in shares) [1],[2]   (1,626,765)
Forfeited (in shares) [1]   (144,096)
Balance at June 30, 2023 (in shares) 4,865,426 4,865,426
Weighted-average grant date fair value per share    
Balance at January 1, 2023 (in dollars per share) [3]   $ 60.12
Shares granted (in dollars per share) [3]   66.74
Vested (in dollars per share) [1],[2],[3]   62.75
Forfeited (in dollars per share) [1],[3]   61.28
Balance at June 30, 2023 (in dollars per share) [3] $ 62.18 $ 62.18
Weighted-Average Aggregate Fair Value    
Weighted average grant date fair value of shares granted [2]   $ 146
Weighted average grant date fair value of shares vested [1],[2]   102
Actual tax benefit/(expense) realized for the tax deductions from the shares vested $ 0 $ 2
Annual grant to eligible employees    
Grant Date    
Grant Date   Mar. 02, 2023
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]   710,633
Weighted-average grant date fair value per share    
Shares granted (in dollars per share) [3],[4]   $ 65.54
[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 six months ended June 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.