| Schedule of Stock-based Compensation Expense and Related Income Tax Benefits |
Stock-based compensation expense and related income tax benefits were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | | | Six Months Ended June 30, | | | | | | (in millions, except shares, per share and contractual life amounts) | 2020 | | 2019 | | 2020 | | 2019 | | | | Stock-based compensation expense | $ | 259 | | | $ | 130 | | | $ | 397 | | | $ | 240 | | | | | Income tax benefit related to stock-based compensation | $ | 49 | | | $ | 25 | | | $ | 71 | | | $ | 45 | | | | | Weighted average fair value per stock award granted | $ | 99.80 | | | $ | 74.35 | | | $ | 96.93 | | | $ | 73.08 | | | | | Unrecognized compensation expense | $ | 824 | | | $ | 744 | | | $ | 824 | | | $ | 744 | | | | | Weighted average period to be recognized (years) | 2.0 | | 2.0 | | 2.0 | | 2.0 | | | | Fair value of stock awards vested | $ | 367 | | | $ | 24 | | | $ | 815 | | | $ | 342 | | | |
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| Schedule of RSU and PRSU Awards Activity |
Time-Based Restricted Stock Units and Restricted Stock Awards | | | | | | | | | | | | | | | | | | | | | | | | | (in millions, except shares, per share and contractual life amounts) | Number of Units or Awards | | Weighted Average Grant Date Fair Value | | Weighted Average Remaining Contractual Term (Years) | | Aggregate Intrinsic Value | | | | | | | | | | Nonvested, December 31, 2019 | 10,503,211 | | | $ | 67.31 | | | 0.9 | | $ | 824 | | | Assumed through acquisition | 1,852,527 | | | 83.90 | | | | | | | Granted | 5,484,615 | | | 95.16 | | | | | | | Vested | (5,430,880) | | | 68.58 | | | | | | | Forfeited | (374,579) | | | 78.57 | | | | | | | | | | | | | | | Nonvested, June 30, 2020 | 12,034,894 | | | 81.64 | | | 1.2 | | 1,253 | |
Performance-Based Restricted Stock Units and Restricted Stock Awards | | | | | | | | | | | | | | | | | | | | | | | | | (in millions, except shares, per share and contractual life amounts) | Number of Units or Awards | | Weighted Average Grant Date Fair Value | | Weighted Average Remaining Contractual Term (Years) | | Aggregate Intrinsic Value | | | | | | | | | | Nonvested, December 31, 2019 | 3,803,539 | | | $ | 69.78 | | | 1.0 | | $ | 300 | | | Assumed through acquisition | 3,535,384 | | | 83.90 | | | | | | | Granted | 1,915,768 | | | 105.37 | | | | | | | Vested | (3,457,232) | | | 72.76 | | | | | | | Forfeited | (130,933) | | | 83.90 | | | | | | | | | | | | | | | Nonvested, June 30, 2020 | 5,666,526 | | | 83.68 | | | 0.9 | | 592 | |
PRSUs included in the table above are shown at target. Share payout can range from 0% to 200% based on different performance outcomes. Weighted average grant date fair value of RSU and PRSU assumed through acquisition is based on the fair value on the date assumed.
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| Schedule of Stock Options Activity |
The following activity occurred under the Stock Option Plans: | | | | | | | | | | | | | | | | | | | Shares | | Weighted Average Exercise Price | | Weighted Average Remaining Contractual Term (Years) | | Outstanding at December 31, 2019 | 194,942 | | | $ | 13.80 | | | 2.9 | | | | | | | | Assumed through acquisition | 1,635,518 | | | 33.37 | | | | | Exercised | (311,587) | | | 46.92 | | | | | Expired/canceled | (3,346) | | | 45.99 | | | | | Outstanding at June 30, 2020 | 1,515,527 | | | 53.52 | | | 4.4 | | Exercisable at June 30, 2020 | 1,509,976 | | | 53.64 | | | 4.4 |
Weighted average grant date fair value of stock options assumed through acquisition is based on the fair value on the date assumed.
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