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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based Compensation Arrangements Activity |  |  |
Stock-based compensation expense | $ 80 | $ 89 | $ 86
Tax benefit recognized on stock-based compensation expense | 13 | 19 | 18
Tax benefit realized for tax deductions resulting from exercises and vestings | 1 | 17 | 32
Restricted Stock [Member] |  |  |
Stock-based Compensation Arrangements Activity |  |  |
Stock-based compensation expense | $ 63 | $ 64 | $ 63
Number of Shares |  |  |
Nonvested shares as of beginning of period (shares) | 1,091,854 |  |
Granted (shares) | 1,126,483 |  |
Vested (shares) | (770,727) |  |
Forfeited (shares) | (9,698) |  |
Nonvested shares as of end of period (shares) | 1,437,912 | 1,091,854 |
Weighted- Average Grant-Date Fair Value Per Share |  |  |
Nonvested shares as of beginning of period (in usd per share) | $ 93.38 |  |
Granted (in usd per share) | 55.62 | $ 98.75 | $ 92.12
Vested (in usd per share) | 82.80 |  |
Forfeited (in usd per share) | 93.73 |  |
Nonvested shares as of end of period (in usd per share) | $ 69.47 | $ 93.38 |
Vested Awards Other Than Options Rollforward |  |  |
Fair value of restricted stock vested (in millions) | $ 35 | $ 74 | $ 80
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 | $ 15 | 23 | 22
Stock Options and Other Awards [Member] |  |  |
Stock-based Compensation Arrangements Activity |  |  |
Stock-based compensation expense | $ 2 | $ 2 | $ 1
Omnibus Stock Incentive Plan [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) | 14,787,213 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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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