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Stock Plans - Performance Share Units and Other Stock-Based Awards Activity (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Number of Shares  
Balance at January 1, 2021 (in shares) | shares 4,896,990
Shares granted (in shares) | shares 2,496,592
Vested (in shares) | shares (2,291,494) [1]
Forfeited (in shares) | shares (126,925)
Balance at March 31, 2021 (in shares) | shares 4,975,163
Weighted-average grant date fair value per share  
Balance at January 1, 2021 (in dollars per share) | $ / shares $ 53.80 [2]
Shares granted (in dollars per share) | $ / shares 55.98 [2]
Vested (in dollars per share) | $ / shares 49.80 [1],[2]
Forfeited (in dollars per share) | $ / shares 56.45 [2]
Balance at March 31, 2021 (in dollars per share) | $ / shares $ 56.67 [2]
Weighted-Average Aggregate Fair Value  
Weighted average grant date fair value of shares granted | $ $ 140 [2]
Weighted average grant date fair value of shares vested | $ 114 [1],[2]
Maximum  
Weighted-Average Aggregate Fair Value  
Actual tax benefit/(expense) realized for the tax deductions from the shares vested | $ $ 6
Annual grant to eligible employees  
Grant Date  
Grant Date Feb. 18, 2021
Performance share units  
Number of Shares  
Shares granted (in shares) | shares 903,250
Weighted-average grant date fair value per share  
Shares granted (in dollars per share) | $ / shares $ 59.35 [2]
Deferred stock units  
Number of Shares  
Shares granted (in shares) | shares 549,710
Weighted-average grant date fair value per share  
Shares granted (in dollars per share) | $ / shares $ 56.13 [2]
Additional shares granted  
Number of Shares  
Shares granted (in shares) | shares 1,043,632 [3]
Weighted-average grant date fair value per share  
Shares granted (in dollars per share) | $ / shares $ 52.99 [2],[3]
[1] The actual tax benefit/(expense) realized and recorded in the provision for income taxes for the tax deductions from the shares vested totaled $6 million in the three months ended March 31, 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.