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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity | The following table presents a summary of 2020 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, 2020 |  | 3,670 |  |  | $ | 84.74 |  |  | 1,775 |  |  | $ | 89.95 |
Granted(2) |  | 1,800 |  |  | 92.04 |  |  | 988 |  |  | 100.04 |
Vested |  | (1,472) |  |  | 89.39 |  |  | (855) |  |  | 88.19 |
Forfeited |  | (165) |  |  | 90.98 |  |  | (147) |  |  | 93.76 |
Unvested as of December 31, 2020 |  | 3,833 |  |  | $ | 86.14 |  |  | 1,761 |  |  | $ | 96.15 |
_________ (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 $83.29 and $100.73 in 2019 and 2018, respectively. The weighted-average grant date fair value of PSUs was $78.18 and $100.65 in 2019 and 2018, respectively.
Summary of Stock Option Activity | The following table presents a summary of 2020 activity for stock options and the balance of stock options exercisable as of December 31, 2020. 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, 2020 |  | 3,185 |  |  | $ | 55.54 |  |  |  |  |
Granted |  | 0 |  |  | 0.00 |  |  |  |  |
Exercised |  | (1,392) |  |  | 44.76 |  |  |  |  |
Forfeited |  | 0 |  |  | 0.00 |  |  |  |  |
Expired |  | 0 |  |  | 0.00 |  |  |  |  |
Outstanding and Exercisable as of December 31, 2020 |  | 1,793 |  |  | $ | 63.91 |  |  | 3.27 years |  | $ | 63 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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