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Long-Term Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of transactions involving stock option awards | Transactions involving stock option awards during 2022 under the Company's Incentive Plans are summarized in the table below.
|  | Number of Shares (In millions) |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (In years) |  | Intrinsic Value (In millions)
Outstanding as of December 31, 2021 |  | 18.0 |  |  | $ | 435.56 |  |  |  |  |
2022: | Granted |  | 2.0 |  |  | $ | 705.02 |  |  |  |  |
| Forfeited |  | (0.4) |  |  | $ | 500.26 |  |  |  |  |
| Exercised |  | (4.0) |  |  | $ | 382.66 |  |  |  |  |
Outstanding as of December 31, 2022 |  | 15.6 |  |  | $ | 481.62 |  |  | 6.3 |  | $ | 3,685.9 |
Vested and expected to vest as of December 31, 2022 |  | 15.1 |  |  | $ | 476.15 |  |  | 6.2 |  | $ | 3,632.8 |
Exercisable as of December 31, 2022 |  | 10.1 |  |  | $ | 420.47 |  |  | 5.0 |  | $ | 2,991.9 |
Schedule of weighted-average exercise prices and weighted-average grant-date fair values of options issued | The table below summarizes the weighted-average exercise prices and weighted-average grant-date fair values of options issued during the years ended December 31, 2022, 2021, and 2020.
|  | Number of Options Granted (In millions) |  | Weighted-Average Exercise Price |  | Weighted-Average Fair Value
2022: |  |  |  |  |  |
Exercise price equal to Market Price |  | 2.0 |  |  | $ | 705.02 |  |  | $ | 220.88 |
2021: |  |  |  |  |  |
Exercise price equal to Market Price |  | 2.3 |  |  | $ | 628.43 |  |  | $ | 174.20 |
2020: |  |  |  |  |  |
Exercise price equal to Market Price |  | 2.9 |  |  | $ | 492.60 |  |  | $ | 126.50 |
Schedule of weighted-average values of assumptions used in computing fair value of option grants | The following table summarizes the weighted average values of the assumptions used in computing the fair value of option grants during 2022, 2021, and 2020.
|  | 2022 |  | 2021 |  | 2020
Expected volatility |  | 28 | % |  | 27 | % |  | 28 | %
Expected lives from grant date |  | 5.2 years |  | 5.5 years |  | 5.0 years
Expected dividend yield |  | 0 | % |  | 0 | % |  | 0 | %
Risk-free interest rate |  | 3.50 | % |  | 1.22 | % |  | 0.47 | %
The following table summarizes the weighted average values of the assumptions used in computing the fair value of PSUs that were granted during 2022 and 2020. The Company did not grant PSUs during 2021.
|  | 2022 |  | 2020
Expected volatility |  | 32% |  | 35%
Expected dividend yield |  | 0% |  | 0%
Risk-free interest rate |  | 3.3% |  | 0.4%
Schedule of activity related to restricted stock awards | A summary of the Company's activity related to restricted stock awards and time-based restricted stock units (excluding performance-based restricted stock units, which are detailed further below) (collectively, "restricted stock") during 2022 is summarized below.
|  | Number of Shares/Units (In millions) |  | Weighted-Average Grant Date Fair Value
Unvested as of December 31, 2021 |  | 2.1 |  |  | $ | 499.85 |
2022: | Granted |  | 0.9 |  |  | $ | 702.32 |
| Vested |  | (0.3) |  |  | $ | 477.22 |
| Forfeited |  | (0.1) |  |  | $ | 522.18 |
Unvested as of December 31, 2022 |  | 2.6 |  |  | $ | 571.19 |
Schedule of activity related to performance-based awards | The table below summarizes activity related to PSUs during 2022. The number of PSUs granted represents the maximum number of units that are eligible to be earned.
|  | Number of Shares/Units (In millions) |  | Weighted-Average Grant Date Fair Value
Unvested as of December 31, 2021 |  | 1.3 |  |  | $ | 209.06 |
2022: | Granted |  | 0.2 |  |  | $ | 485.61 |
Unvested as of December 31, 2022 |  | 1.5 |  |  | $ | 245.94 |

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&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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