Stock-Based Compensation - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate maximum of common shares (in shares)	20		20
Common shares available for grant (in shares)	18		18
Stock-based compensation expense	$ 30	$ 31	$ 65	$ 66
Stock Options, SARs and ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense related to stock options, SAR and ESPP grants	8	9	17	19
Unrecognized compensation expense	46		$ 46
Weighted average period over which unrecognized compensation expense will be recognized (in years)			1 year 7 months 6 days
Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	151		$ 151
Weighted average period over which unrecognized compensation expense will be recognized (in years)			1 year 3 months 18 days
Share-based compensation arrangement by restricted stock and restricted stock units compensation cost	20	21	$ 45	45
Performance Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	10		$ 10
Weighted average period over which unrecognized compensation expense will be recognized (in years)			1 year 8 months 12 days
Performance period for performance units and shares (in years)			3 years
Minimum performance multiple at the completion of the performance period (as a percent)			0.00%
Maximum performance multiple at the completion of the performance period (as a percent)			200.00%
Stock-based compensation expense	$ 2	$ 1	$ 3	$ 2

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Minimum Performance Multiple to be Applied to Performance Stock/Units Granted at the Completion of the Performance Period

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performance period for performance units

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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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.

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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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