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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Stockholders' Equity Note [Abstract]  
Stock Option Plan Activity and Stock Options Granted
The following tables summarize the details of options granted under our stock option plans that were still outstanding as of December 31, 2021, and the assumptions used to value those grants. All such grants were effective at the close of business on the date of grant.
 
Options
Granted		Option Exercise
(Strike) Price		Closing Stock
Price on Date
of Grant		December 31, 2021
Date of GrantOptions
Outstanding		Options
Exercisable
January 4, 2021741,510 $48.00 $47.650 711,199 26,643 
January 2, 2020902,263 $38.00 $37.230 846,225 24,964 
January 2, 20191,316,924 $26.00 $25.705 1,017,660 268,714 
January 2, 20181,087,936 $27.50 $27.270 743,788 318,052 
January 3, 20171,529,578 $23.50 $23.475 732,180 363,406 
April 19, 20161,690,880 $23.00 $22.870 524,119 331,739 
April 21, 20151,786,440 $21.00 $20.630 403,736 240,908 
April 22, 20141,910,000 $28.00 $25.265 186,391 111,407 
April 16, 2013410,000 $27.00 $24.625 7,972 7,972 
Total11,375,531 5,173,270 1,693,805 
A summary of activities under our stock option plans consisted of the following:
Options
Outstanding
Exercise
Price (1)
Remaining
Life (2)
Outstanding as of January 1, 20215,914,757 $26.73 6.22
Granted741,510 $48.00 9.00
Exercised(1,305,107)$24.34 
Cancelled/forfeited(177,890)$31.22 
Outstanding as of December 31, 20215,173,270 $30.23 6.08
Exercisable as of December 31, 20211,693,805 $25.11 4.68
 
Options
Outstanding
Exercise
Price (1)
Remaining
Life (2)
Outstanding as of January 1, 20206,807,217 $24.89 6.09
Granted902,263 $38.00 9.00
Exercised(1,630,664)$25.18 
Cancelled/forfeited(164,059)$27.64 
Outstanding as of December 31, 20205,914,757 $26.73 6.22
Exercisable as of December 31, 20201,885,241 $24.23 4.71
(1) Weighted average exercise price.
(2) Weighted average remaining contractual life in years.
Fair Value Assumptions for Options Granted
Date of GrantRisk-free
Interest Rate		Expected Life
of Option in
Years		Expected
Dividend
Yield		Expected
Stock
Volatility		Estimated Fair
Value of Stock
Option
January 4, 20210.4% 5.002.0% 29.17 %$9.57 
January 2, 20201.7% 5.002.4% 25.70 %$6.81 
January 2, 20192.5% 5.002.9% 23.96 %$4.40 
January 2, 20182.2% 5.002.3% 23.45 %$5.02 
January 3, 20171.9% 5.002.6% 24.49 %$4.20 
April 19, 20161.3% 5.002.6% 26.34 %$4.09 
April 21, 20151.3% 5.002.7% 26.84 %$3.68 
April 22, 20141.8% 5.002.0% 28.55 %$4.79 
April 16, 20130.7% 5.001.6% 37.42 %$6.33 
Schedule of Common Stock Outstanding Roll Forward
Shares of common stock outstanding were as follows:
202120202019
Balance at beginning of year574,159,575 574,128,911 571,803,838 
Stock options exercised1,305,107 1,630,664 2,325,073 
Purchases of common stock— (1,600,000)— 
Balance at end of year575,464,682 574,159,575 574,128,911 
Reconciliation of Denominators used in Computation of Basic and Diluted Earnings per Share
The following tables present a reconciliation of the denominators used in the computation of basic and diluted earnings per share and a summary of the options to purchase shares of common stock which were excluded from the diluted earnings calculation because they were anti-dilutive:
Reconciliation202120202019
Basic weighted average shares outstanding574,808,030 573,778,761 573,202,152 
Weighted shares assumed upon exercise of stock options2,309,026 1,893,193 1,239,476 
Diluted weighted average shares outstanding577,117,056 575,671,954 574,441,628 
Anti-Dilutive Options Excluded
Summary of Anti-dilutive Options Excluded202120202019
Options to purchase shares of common stock678,310 846,041 — 
Weighted average exercise prices of options$48.00 38.00 —