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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Restricted Stock Units and Performance Share Units | The following table presents a summary of 2019 activity for RSUs and PSUs. Table 13.1: Summary of Restricted Stock Units and Performance Share Units
|  | Restricted Stock Units |  | Performance Share Units(1)
(Shares/units in thousands) |  | Units |  | Weighted-Average Grant Date Fair Value per Unit |  | Units |  | Weighted-Average Grant Date Fair Value per Unit
Unvested as of January 1, 2019 |  | 3,345 |  |  | $ | 85.01 |  |  | 1,804 |  |  | $ | 87.48 |
Granted(2) |  | 1,965 |  |  | 83.29 |  |  | 1,018 |  |  | 78.18 |
Vested |  | (1,450 | ) |  | 82.94 |  |  | (1,012 | ) |  | 73.68 |
Forfeited |  | (190 | ) |  | 88.22 |  |  | (35 | ) |  | 90.47 |
Unvested as of December 31, 2019 |  | 3,670 |  |  | $ | 84.74 |  |  | 1,775 |  |  | $ | 89.95 |
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(1) | Granted and vested include adjustments for achievement of specific performance goals for performance share units granted in prior periods.
(2) The weighted-average grant date fair value of RSUs was $100.73 and $86.20 in 2018 and 2017, respectively. The weighted-average grant date fair value of PSUs was $100.65 and $82.48 in 2018 and 2017, respectively.
Summary of Stock Option Activity | The following table presents a summary of 2019 activity for stock options and the balance of stock options exercisable as of December 31, 2019. Table 13.2: Summary of Stock Options Activity
(Shares in thousands, and intrinsic value in millions) |  | Shares Subject to Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding as of January 1, 2019 |  | 3,456 |  |  | $ | 56.03 |  |  |  |  |
Granted |  | 0 |  |  | 0.00 |  |  |  |  |
Exercised |  | (271 | ) |  | 61.83 |  |  |  |  |
Forfeited |  | 0 |  |  | 0.00 |  |  |  |  |
Expired |  | 0 |  |  | 0.00 |  |  |  |  |
Outstanding as of December 31, 2019 |  | 3,185 |  |  | $ | 55.54 |  |  | 2.81 years |  | $ | 151 |
Exercisable as of December 31, 2019 |  | 3,034 |  |  | $ | 54.01 |  |  | 2.60 years |  | $ | 148 |

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