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Share-Based Compensation Long Term Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Millions								1 Months Ended					3 Months Ended				12 Months Ended
	Apr. 26, 2018	Apr. 25, 2018	Apr. 27, 2017	Apr. 26, 2017	Apr. 28, 2016	Apr. 27, 2016	Apr. 23, 2015	Feb. 28, 2018	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU Conversion Ratio														$ 1.17
PLC Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum Shares Available for Grant under PLC LTIP							25,665,448
PLC Long Term Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-Based Awards Payout % Range																	0.00%
PLC Long Term Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance-Based Awards Payout % Range																	200.00%
PLC Long Term Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted																	1,242,000	1,245,000	1,219,000
Grant Date Fair Value								$ 61	$ 63	$ 48	$ 76	$ 53
Time-Based Awards % Granted For Officers																	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%
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	22,676		26,782		27,238		20,347
Grant Date Fair Value	$ 2		$ 2		$ 2		$ 2
RSU's, Issued in Period, Gross		24,642		26,580		24,542
Fair Value of RSU’s Vested in Period		$ 2		$ 2		$ 2
RSU's, Used to Pay Witholding Taxes		(2,649)		(3,472)		(1,843)
PLC Long Term Incentive Plan | Restricted Stock Units (RSUs) | Executives | 2014 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted												780,000
PLC Long Term Incentive Plan | Restricted Stock Units (RSUs) | Executives | 2015 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted											900,000
PLC Long Term Incentive Plan | Restricted Stock Units (RSUs) | Executives | 2016 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's Granted										710,000
PLC Long Term Incentive Plan | Restricted Stock Units (RSUs) | Executives | 2017 Grant [Member]
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) | Executives | 2018 Grant [Member]
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 | Time-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's, Issued in Period, Gross								285,344	248,008	395,744
Fair Value of RSU’s Vested in Period								$ 26	$ 19	$ 24
RSU's, Used to Pay Witholding Taxes								102,045	88,807	(146,726)
PLC Long Term Incentive Plan | Restricted Stock Units (RSUs) | Executives | Performance-Based | 2013 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's, Issued in Period, Gross															797,210	1,265,339
Fair Value of RSU’s Vested in Period															$ 60	$ 77
RSU's, Used to Pay Witholding Taxes															324,555	(512,371)
PLC Long Term Incentive Plan | Restricted Stock Units (RSUs) | Executives | Performance-Based | 2015 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's, Issued in Period, Gross													640,239
Fair Value of RSU’s Vested in Period													$ 59
RSU's, Used to Pay Witholding Taxes													240,483

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

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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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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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