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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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Stock-Based Compensation - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
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)	15		15
Stock-based compensation expense	$ 57	$ 34	$ 126	$ 99
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	11	20	28
Unrecognized compensation expense	17		$ 17
Weighted average period over which unrecognized compensation expense will be recognized (in years)			10 months 24 days
Restricted Stock And Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	398		$ 398
Weighted average period over which unrecognized compensation expense will be recognized (in years)			2 years
Share-based compensation arrangement by restricted stock and restricted stock units compensation cost	43	18	$ 95	63
Performance Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	22		$ 22
Weighted average period over which unrecognized compensation expense will be recognized (in years)			1 year 10 months 24 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%
Average return on capital employed (in years)			3 years
Maximum performance multiple at the completion of the performance period if TSR is negative (as a percent)			100.00%
Stock-based compensation expense	$ 6	$ 5	$ 11	$ 8
Performance Unit \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modifier applied to performance based multiple			(70.00%)
Performance Unit \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Modifier applied to performance based multiple			70.00%