The number of non-option equity instruments that are vested but not yet distributed as of the balance sheet date.

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Weighted average fair value as of grant date for RSUs vested but not yet distributed at the end of the reporting period.

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The total fair value of share-based awards other than options granted during the reporting period.

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Represents the number of shares that vested in the period that were used to pay minimum witholding taxes.

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

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Number of grantees affected by modification of award under share-based payment arrangement.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Share-Based Compensation Summary of Activity for LTIP RSU's (Details) $ / shares in Units, $ in Millions						1 Months Ended					3 Months Ended		12 Months Ended
	Apr. 30, 2021 USD ($) shares	Apr. 29, 2021 USD ($) shares	Apr. 23, 2020 USD ($) shares	Apr. 22, 2020 USD ($) shares	Apr. 25, 2019 USD ($) shares	Feb. 28, 2021 USD ($) shares	Feb. 29, 2020 USD ($)	Feb. 28, 2019 USD ($) shares	Feb. 28, 2018 USD ($) shares	Feb. 28, 2017 USD ($) shares	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($) shares	Dec. 31, 2021 USD ($) numberOfEmployees $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Taxes withheld and paid on employees' restricted share awards \| $													$ (45)	$ (33)	$ (34)
Share-based Payment Arrangement, Plan Modification, Incremental Cost \| $														$ 22
Share-based Payment Arrangement, Plan Modification, Number of Grantees Affected \| numberOfEmployees													300
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 \| $ / shares													$ 131.40	$ 102.95	$ 89.32	$ 81.24
LTIP Grants in Period, Weighted Average Grant Date Fair Value per share \| $ / shares													161.90	99.14	83.93
LTIP Vested in Period, Weighted Average Grant Date Fair Value per share \| $ / shares													98.55	98.90	70.78
LTIP Shares, Forfeitures, Weighted Average Grant Date Fair Value per share \| $ / shares													$ 118.97	$ 82.93	$ 83.97
Share-based Compensation Expense \| $													$ 87	$ 60	$ 66
Share-based Compensation Expense, Net of Tax \| $													86	60	65
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized \| $													$ 103
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition													2 years
Taxes withheld and paid on employees' restricted share awards \| $													$ (45)	$ (33)	$ (34)
PLC Long Term Incentive Plan \| Performance-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Shares, Vested but not yet Distributed, Weighted Average Grant Date Fair Value per share \| $ / shares													$ 127.22
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Shares, Nonvested, Number													1,344,000	1,786,000	1,822,000	1,879,000
RSU's Granted													661,000	934,000	1,363,000
LTIP RSU's, Vested in Period													(829,000)	(773,000)	(1,131,000)
LTIP Shares, Forfeited in Period													(274,000)	(197,000)	(289,000)
Grant Date Fair Value \| $						$ 72	$ 62	$ 62	$ 61	$ 63
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	17,589		48,745		20,765
Grant Date Fair Value \| $	$ 3		$ 3		$ 2
RSU's, Issued in Period, Gross		41,896		23,816
Fair Value of RSU’s Vested in Period \| $		$ 6		$ 1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Withheld for Taxes in Period		6,849		2,041
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs) \| Executives \| 2018 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted									630,000
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs) \| Executives \| 2017 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted										800,000
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs) \| Performance-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP Shares, Vested but not yet Distributed, Number													322,000
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs) \| Performance-Based \| Executives \| 2016 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's, Issued in Period, Gross												493,674
Fair Value of RSU’s Vested in Period \| $												$ 41
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Withheld for Taxes in Period												(199,547)
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs) \| Performance-Based \| Executives \| 2018 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's, Issued in Period, Gross													288,074
Fair Value of RSU’s Vested in Period \| $													$ 43
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Withheld for Taxes in Period													(121,609)
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs) \| Performance-Based \| Executives \| 2017 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's, Issued in Period, Gross											580,390
Fair Value of RSU’s Vested in Period \| $											$ 45
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Withheld for Taxes in Period											(243,080)
PLC Long Term Incentive Plan \| Restricted Stock Units (RSUs) \| Time-Based \| Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's, Issued in Period, Gross						449,426		529,812			468,240
Fair Value of RSU’s Vested in Period \| $						$ 67	$ 37	$ 44
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Withheld for Taxes in Period						(177,825)		(203,839)			(181,495)