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Stock Plans (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Stock Options Activity
Stock option activity is reflected below:
 Shares Subject
to Option		Weighted-
Average
Exercise or
Grant Price
Per Share		Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance at January 1, 202127,751,894 $39.515 years$527  million
Annual grant to eligible employees2,412,710 56.13
Additional options issued148,660 58.00
Total options granted2,561,370 56.24
Options exercised (1)
(4,342,186)34.15$110  million
Options canceled(347,906)47.57
Balance at June 30, 202125,623,172 41.985 years$524  million

(1)Cash received from options exercised was $73 million in the three months and $140 million in the six months ended June 30, 2021. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $7 million in the three months and $14 million in the six months ended June 30, 2021.
Performance Share Units and Other Stock-Based Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Performance Share Units and Stock-Based Awards Activity
Our performance share unit, deferred stock unit and historically granted restricted stock activity is reflected below:
Number
of Shares		Grant Date
Weighted-Average
Fair Value
Per Share (3)
Weighted-Average
Aggregate
Fair Value (3)
Balance at January 1, 20214,896,990 $53.80
Annual grant to eligible employees:Feb 18, 2021
Performance share units903,250 59.35
Deferred stock units550,090 56.13
Additional shares granted (1)
1,122,130 Various53.50
Total shares granted2,575,470 56.11$145  million
Vested (2)
(2,351,013)49.72$117  million
Forfeited(198,602)56.66
Balance at June 30, 20214,922,845 56.84

(1)Includes performance share units and deferred stock units.
(2)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 six months ended June 30, 2021.
(3)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.