Share-Based Compensation Long Term Incentive Plan (Details) - PLC Long Term Incentive Plan - USD ($) $ in Millions						1 Months Ended					3 Months Ended		12 Months Ended
	Apr. 30, 2021	Apr. 29, 2021	Apr. 23, 2020	Apr. 22, 2020	Apr. 25, 2019	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Apr. 23, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Shares Available for Grant under PLC LTIP																25,665,448
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-Based Awards Payout % Range														0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-Based Awards Payout % Range													200.00%	150.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted													661,000	934,000	1,363,000
Grant Date Fair Value						$ 72	$ 62	$ 62	$ 61	$ 63
Time-Based Awards % Granted For Officers													40.00%	25.00%
Time-Based Awards % Granted For Executives													50.00%
Performance-Based Awards % Granted For Officers													75.00%
Performance-Based Awards % Granted For Executives													50.00%
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
RSU's, Used to Pay Witholding Taxes		(6,849)		(2,041)
Restricted Stock Units (RSUs) | Executives | 2017 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted										800,000
Restricted Stock Units (RSUs) | Executives | 2018 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted									630,000
Restricted Stock Units (RSUs) | Executives | 2019 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted								710,000
Restricted Stock Units (RSUs) | Executives | 2021 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted						440,000
Restricted Stock Units (RSUs) | Executives | 2020 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted							750,000
Restricted Stock Units (RSUs) | Executives | Time-Based
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
RSU's, Used to Pay Witholding Taxes						177,825		203,839			181,495
Restricted Stock Units (RSUs) | Executives | Performance-Based | 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
RSU's, Used to Pay Witholding Taxes												199,547
Restricted Stock Units (RSUs) | Executives | Performance-Based | 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
RSU's, Used to Pay Witholding Taxes											243,080
Restricted Stock Units (RSUs) | Executives | Performance-Based | 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
RSU's, Used to Pay Witholding Taxes													121,609