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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of pre-tax compensation expense and the related income tax benefit for these stock-based incentives | Pre-tax compensation expense included in income from continuing operations for these stock-based incentives was as follows, in millions:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Long-term stock awards |  |  |  |  | $ | 3 |  |  | $ | 4 |
Stock options |  |  |  |  | 4 |  |  | 3 |
Restricted stock units |  |  |  |  | 19 |  |  | 8 |
Performance restricted stock units |  |  |  |  | 2 |  |  | 1 |
Phantom stock awards |  |  |  |  | 2 |  |  | — |
Total |  |  |  |  | $ | 30 |  |  | $ | 16 |
Schedule of the Company's long-term stock award activity | Our long-term stock award activity was as follows, shares in millions:
| Three Months Ended March 31,
| 2021 |  | 2020
Unvested stock award shares at January 1 | 1 |  |  | 2 |
Weighted average grant date fair value | $ | 36 |  |  | $ | 34 |
Stock award shares vested | — |  |  | 1 |
Weighted average grant date fair value | $ | 34 |  |  | $ | 32 |
Stock award shares forfeited | — |  |  | — |
Weighted average grant date fair value | $ | 37 |  |  | $ | 35 |
Unvested stock award shares at March 31 | 1 |  |  | 1 |
Weighted average grant date fair value | $ | 37 |  |  | $ | 36 |
Schedule of the Company's stock option activity | Our stock option activity was as follows, shares in millions:
|  | Three Months Ended March 31,
|  | 2021 |  |  | 2020
Option shares outstanding, January 1 |  | 2 |  |  |  | 3 |
Weighted average exercise price | $ | 33 |  |  | $ | 27 |
Option shares granted |  | 1 |  |  |  | 1 |
Weighted average exercise price | $ | 56 |  |  | $ | 48 |
Option shares exercised |  | — |  |  |  | 1 |
Aggregate intrinsic value on date of exercise (A) | $ | — |  | $ | 22 million
Weighted average exercise price | $ | — |  |  | $ | 17 |
Option shares forfeited |  | — |  |  |  | — |
Weighted average exercise price | $ | 11 |  |  | $ | 42 |
Option shares outstanding, March 31 |  | 3 |  |  |  | 3 |
Weighted average exercise price | $ | 36 |  |  | $ | 32 |
Weighted average remaining option term (in years) |  | 7 |  |  | 7
Option shares vested and expected to vest, March 31 |  | 3 |  |  |  | 3 |
Weighted average exercise price | $ | 36 |  |  | $ | 32 |
Aggregate intrinsic value (A) | $ | 65 million |  | $ | 14 million
Weighted average remaining option term (in years) |  | 6 |  |  | 7
Option shares exercisable (vested), March 31 |  | 2 |  |  |  | 1 |
Weighted average exercise price | $ | 30 |  |  | $ | 26 |
Aggregate intrinsic value (A) | $ | 51 million |  | $ | 13 million
Weighted average remaining option term (in years) |  | 5 |  |  | 6
(A) Aggregate intrinsic value is calculated using our stock price at each respective date, less the exercise price (grant date price), multiplied by the number of shares.
Schedule of weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model | The weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model were as follows:
| Three Months Ended March 31,
| 2021 |  | 2020
Weighted average grant date fair value | $ | 13.61 |  |  | $ | 10.67 |
Risk-free interest rate | 0.75 | % |  | 1.53 | %
Dividend yield | 1.67 | % |  | 1.14 | %
Volatility factor | 30.00 | % |  | 24.00 | %
Expected option life | 6 years |  | 6 years

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 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 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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