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Stock Compensation Plans - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units	$ 26	$ 36
Stock options	5	6
Employee stock purchase plan	3	2
Stock-based compensation expense	34	44
Tax Benefit	(4)	(5)
Stock-based compensation expense (net of tax)	$ 30	$ 39

X

- Definition

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

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Amount, after tax, of expense for award under share-based payment arrangement.

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The amount of plan compensation cost recognized during the period.

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

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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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Amount of noncash expense for option under share-based payment arrangement.

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