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Equity and Share-Based Compensation
 6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Equity and Share-Based Compensation Equity and Share-Based Compensation
Weighted-Average Common Shares Outstanding
Three Months Ended
June 30,		Six Months Ended
June 30,
(in millions)2021202020212020
Weighted-average number of common shares outstanding – basic4,601 4,570 4,596 4,566 
Effect of dilutive securities72 37 73 45 
Weighted-average number of common shares outstanding – diluted4,673 4,607 4,669 4,611 
Diluted earnings per common share attributable to Comcast Corporation shareholders (“diluted EPS”) considers the impact of potentially dilutive securities using the treasury stock method. The amount of potential common shares related to our share-based compensation plans that were excluded from diluted EPS because their effect would have been antidilutive was not material in any of the periods presented.
Accumulated Other Comprehensive Income (Loss)
(in millions)June 30,
2021		December 31,
2020
Cumulative translation adjustments$1,806 $1,790 
Deferred gains (losses) on cash flow hedges— (109)
Unrecognized gains (losses) on employee benefit obligations and other186 203 
Accumulated other comprehensive income (loss), net of deferred taxes$1,992 $1,884 
Share-Based Compensation
Our share-based compensation plans consist primarily of awards of RSUs and stock options to certain employees and directors as part of our approach to long-term incentive compensation. Additionally, through our employee stock purchase plans, employees are able to purchase shares of our common stock at a discount through payroll deductions.
In March 2021, we granted 12.8 million RSUs and 42.3 million stock options related to our annual management awards. The weighted-average fair values associated with these grants were $54.62 per RSU and $9.64 per stock option.
Recognized Share-Based Compensation Expense
 Three Months Ended
June 30,		Six Months Ended
June 30,
(in millions)2021202020212020
Restricted share units$185 $179 $391 $320 
Stock options89 83 178 154 
Employee stock purchase plans9 9 20 21 
Total$282 $271 $589 $495 
As of June 30, 2021, we had unrecognized pretax compensation expense of $1.4 billion and $726 million related to nonvested RSUs and nonvested stock options, respectively.