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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, 2021
Sep. 30, 2021
Number of Shares    
Balance at January 1, 2021 (in shares)   4,896,990
Shares granted (in shares)   2,598,290
Vested (in shares) [1]   (2,372,833)
Forfeited (in shares)   (304,382)
Balance at September 30, 2021 (in shares) 4,818,065 4,818,065
Weighted-average grant date fair value per share    
Balance at January 1, 2021 (in dollars per share) [2]   $ 53.80
Shares granted (in dollars per share) [2]   56.17
Vested (in dollars per share) [1],[2]   49.75
Forfeited (in dollars per share) [2]   57.32
Balance at September 30, 2021 (in dollars per share) [2] $ 56.85 $ 56.85
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]   118
Maximum    
Weighted-Average Aggregate Fair Value    
Actual tax benefit/(expense) realized for the tax deductions from the shares vested $ 1 $ 6
Annual grant to eligible employees    
Grant Date    
Grant Date   Feb. 18, 2021
Performance share units    
Number of Shares    
Shares granted (in shares)   903,250
Weighted-average grant date fair value per share    
Shares granted (in dollars per share) [2]   $ 59.35
Deferred stock units    
Number of Shares    
Shares granted (in shares)   550,090
Weighted-average grant date fair value per share    
Shares granted (in dollars per share) [2]   $ 56.13
Additional shares granted    
Number of Shares    
Shares granted (in shares) [3]   1,144,950
Weighted-average grant date fair value per share    
Shares granted (in dollars per share) [2],[3]   $ 53.68
[1] The actual tax benefit/(expense) realized and recorded in the provision for income taxes for the tax deductions from the shares vested totaled less than $1 million in the three months and $6 million in the nine months ended September 30, 2021.
[2] The grant date fair value of performance share units 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.
[3] Includes performance share units and deferred stock units.