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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Changes In Stock Options | The following table summarizes the changes in the number of shares of common stock for 2021 (shares and aggregate intrinsic value in millions):
| Shares |  | Weighted- Average Exercise Price Per Share |  | Weighted Average Remaining Life (years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2020 | 2.7 |  |  | $ | 18 |  |  |  |  |
Granted | 2.4 |  |  | 24 |  |  |  |  |
Exercised | (0.3) |  |  | 15 |  |  |  |  |
Forfeited | — |  |  | 20 |  |  |  |  |
Outstanding at December 31, 2021 | 4.8 |  |  | $ | 21 |  |  | 8.5 |  | 7.8
Options exercisable, end of year | 1.3 |  |  | $ | 18 |  |  | 7.9 |  | 4.4
Schedule of Weighted Average Assumptions Used to Determined the Fair Value of Stock Options Granted | The weighted average assumptions used to determine the fair value of stock options granted for the years ended December 31, are as follows:
| 2021 |  | 2020
Expected life in years | 6 |  | 6
Risk-free interest rate | 0.8 | % |  | 1.4 | %
Expected volatility | 44.2 | % |  | 41.3 | %
Expected dividend yield | 5.1 | % |  | 3.9 | %
Summary of Changes of Restricted Stock and Restricted Stock Units | The following table summarizes the changes in the number of outstanding restricted stock units for 2021 (shares in millions):
| Restricted Stock Units |  | Weighted- Average Grant Date Fair Value Per Share
Outstanding at December 31, 2020 | 4.3 |  |  | $ | 21 |
Granted | 1.9 |  |  | 25 |
Grant adjustment (1) | (0.3) |  |  | 23 |
Vested | (1.3) |  |  | 21 |
Forfeited | (0.3) |  |  | 22 |
Outstanding at December 31, 2021 | 4.3 |  |  | $ | 22 |
Expected to vest at December 31, 2021 | 5.6 |  |  | $ | 22 |
(1)The Grant Adjustment primarily relates to an adjustment in the quantity of Stock-Price Based RSUs ultimately vested during 2021 that were dependent on the level of achievement of the specified performance conditions.
Summary of Total Unrecognized Compensation Cost Related to Stock-based Compensation | The following table summarizes the Company's total unrecognized compensation cost related to stock-based compensation at December 31, 2021:
(in millions) | Unrecognized Compensation Cost | Weighted Average Period of Expense Recognition (in years)
Restricted stock units | $ | 43 |  | 1
Stock options | 10 |  | 1
Total | $ | 53 |  | 1

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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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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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