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Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 5 | $ 4
Unearned compensation cost related to the unvested portion of all stock-based awards | $ 45 |
Remaining vesting period | through the first quarter of 2025 |
Restricted Stock Units |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Equity instruments granted (shares) | 0.6 |
Weighted average fair value per share granted (dollars per share) | $ 15.75 |
Performance Share Units |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Equity instruments granted (shares) | 0.4 |
Weighted average fair value per share granted (dollars per share) | $ 15.60 |

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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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- 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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