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

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the 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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Share-Based Compensation Summary of Activity for LTIP RSU's (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended								3 Months Ended		9 Months Ended
	Apr. 30, 2023	Feb. 28, 2023	Apr. 30, 2022	Feb. 28, 2022	Apr. 30, 2021	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payment, Tax Withholding, Share-based Payment Arrangement											$ 31	$ 36
PLC Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Nonvested, Weighted Average Grant Date Fair Value per share									$ 129.57		$ 129.57		$ 136.61
LTIP Grants in Period, Weighted Average Grant Date Fair Value per share											118.75
LTIP Vested in Period, Weighted Average Grant Date Fair Value per share											119.47
LTIP RSUs, Forfeitures, Weighted Average Grant Date Fair Value per share											$ 111.66
Share-based Compensation Expense									$ 29	$ 19	$ 77	65
Share-based Compensation Expense, net of tax									29	$ 19	76	65
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized									$ 190		$ 190
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition											2 years
Payment, Tax Withholding, Share-based Payment Arrangement											$ 31	$ 36
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Shares, Nonvested, Number									2,158,000		2,158,000		1,247,000
RSU's Granted											1,432,000
LTIP RSUs, Vested in Period											(334,000)
LTIP RSUs, Forfeited in Period											(187,000)
Grant Date Fair Value		$ 99		$ 80		$ 72	$ 62	$ 62
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs) \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted	20,584		23,387		17,589
RSU's Issued in Period, Gross	20,457		15,633
Fair Value of RSUs Vested in Period	$ 2		$ 2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Withheld for Taxes in Period	2,930		1,956
Grant Date Fair Value	$ 2		$ 2		$ 3
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs) \| Executives \| Time-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Issued in Period, Gross		286,337		354,600
Fair Value of RSUs Vested in Period		$ 33		$ 46
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Withheld for Taxes in Period		(116,753)		(140,409)
WR Value Share Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense									$ 2		$ 5
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized									$ 22		$ 22
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition											2 years