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Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Weighted-Average Black-Scholes Fair Value Assumptions
Our weighted-average Black-Scholes and Lattice Model fair value assumptions were:
 Risk-Free
Interest Rate		Expected LifeExpected
Volatility		Expected
Dividend Yield		Fair Value
at Grant Date
20210.57%5 years23.45%2.20%$9.08
20201.34%5 years19.64%2.06%$8.61
20192.46 %5 years19.96 %2.37 %$7.83
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, 201943,818,830 $32.36 $371  million
Annual grant to eligible employees4,793,570 47.72 
Additional options issued68,420 50.82 
Total options granted4,861,990 47.76 
Options exercised (1)
(13,668,354)27.53 $306  million
Options cancelled(1,156,518)42.22 
Balance at December 31, 201933,855,948 36.19 $640  million
Annual grant to eligible employees2,280,440 59.04 
Additional options issued136,360 49.48 
Total options granted2,416,800 58.50 
Options exercised (1)
(7,847,964)30.55 $205  million
Options cancelled(672,890)44.94 
Balance at December 31, 202027,751,894 39.51 $527  million
Annual grant to eligible employees2,412,710 56.13 
Additional options issued160,640 58.17 
Total options granted2,573,350 56.26 
Options exercised (1)
(6,249,330)33.68 $169  million
Options cancelled(572,155)49.65 
Balance at December 31, 202123,503,759 42.65 5 years$556  million
Exercisable at December 31, 202118,570,547 39.40 4 years$500  million
 
(1)Cash received from options exercised was $206 million in 2021, $236 million in 2020 and $369 million in 2019. The actual tax benefit realized and recorded in the provision for income taxes for the tax deductions from the option exercises totaled $24 million in 2021, $27 million in 2020 and $40 million in 2019.
Deferred units, performance share units and other stock-based awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Deferred Stock Units, Performance Share Units and Restricted Stock Activity
Our performance share unit, deferred stock unit and other stock-based award activity is reflected below:
Number
of Shares		Grant DateWeighted-Average
Fair Value
Per Share (4)		Weighted-Average
Aggregate
Fair Value (3)
Balance at January 1, 20196,559,010 $42.19 
Annual grant to eligible employees:Feb. 22, 2019
Performance share units891,210 57.91 
Deferred stock units666,880 47.72 
Additional shares granted (1)
205,073 Various54.81 
Total shares granted1,763,163 53.69 $95  million
Vested (2) (3)
(2,007,848)37.81 $76  million
Forfeited (2)
(652,380)45.88 
Balance at December 31, 20195,661,945 46.90 
Annual grant to eligible employees:Feb. 20, 2020
Performance share units825,230 65.83 
Deferred stock units545,550 59.04 
Additional shares granted (1)
390,730 Various56.90 
Total shares granted1,761,510 61.75 $109  million
Vested (2) (3)
(2,051,054)42.87 $88  million
Forfeited (2)
(475,411)48.24 
Balance at December 31, 20204,896,990 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)
1,163,644 Various53.76 
Total shares granted2,616,984 56.19 $147  million
Vested (3)
(2,459,427)49.59 $122  million
Forfeited(386,501)57.52 
Balance at December 31, 20214,668,046 57.04 

(1)Includes performance share units and deferred stock units.
(2)Includes performance share units, deferred stock units and other stock-based awards.
(3)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 2021, $5 million in 2020 and $2 million in 2019.
(4)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.