Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
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

Share based compensation arrangement by share based payment award award vesting period description.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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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).

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-Publisher FASB
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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).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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