Stock Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 20	$ 23	$ 28
Deferred tax benefit related to compensation expense	3	4	5
Unamortized compensation expense related to stock options	$ 21
Unamortized compensation expense recognition period	1 year 7 months 6 days
Deferred units, performance share units and other stock-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 100	98	98
Deferred tax benefit related to compensation expense	$ 17	$ 16	$ 15
Unamortized compensation expense recognition period	10 months 24 days
Unamortized compensation expense related to deferred stock units, performance share units and restricted stock	$ 113
2005 Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares award expiration date	May 21, 2024
Shares authorized to be issued under stock option plan (in shares)	243.7
Shares available to be granted (in shares)	45.5

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

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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 cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Date the equity-based award expires, in YYYY-MM-DD format.

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Number of shares authorized for issuance 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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