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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock-based Compensation Arrangements Activity |  |  |
Stock-based compensation expense | $ 88 | $ 80 | $ 89
Tax benefit recognized on stock-based compensation expense | 13 | 13 | 19
Tax benefit realized for tax deductions resulting from exercises and vestings | 1 | 1 | 17
Restricted Stock [Member] |  |  |
Stock-based Compensation Arrangements Activity |  |  |
Stock-based compensation expense | $ 65 | $ 63 | $ 64
Number of Shares |  |  |
Nonvested shares as of beginning of period (shares) | 1,437,912 |  |
Granted (shares) | 831,337 |  |
Vested (shares) | (797,751) |  |
Forfeited (shares) | (13,307) |  |
Nonvested shares as of end of period (shares) | 1,458,191 | 1,437,912 |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Nonvested shares as of beginning of period (in usd per share) | $ 69.47 |  |
Granted (in usd per share) | 77.71 | $ 55.62 | $ 98.75
Vested (in usd per share) | 75.36 |  |
Forfeited (in usd per share) | 70.64 |  |
Nonvested shares as of end of period (in usd per share) | $ 70.93 | $ 69.47 |
Vested Awards Other Than Options Rollforward |  |  |
Fair value of restricted stock vested (in millions) | $ 59 | $ 35 | $ 74
Stock Based Compensation (Textual) |  |  |
Vesting period of stock-based payment awards granted | 3 years |  |
Unrecognized share-based compensation cost related to outstanding unvested awards | $ 57 |  |
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards | 2 years |  |
Performance Awards [Member] |  |  |
Stock-based Compensation Arrangements Activity |  |  |
Stock-based compensation expense | $ 21 | 15 | 23
Stock Options and Other Awards [Member] |  |  |
Stock-based Compensation Arrangements Activity |  |  |
Stock-based compensation expense | $ 2 | $ 2 | $ 2
2020 Omnibus Stock Incentive Plan (2020 OSIP) [Member] | Share-based Payment Arrangement [Member] |  |  |
Stock Based Compensation (Textual) |  |  |
Number of shares of common stock available to be awarded under stock-based compensation plans (shares) | 13,566,535 |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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