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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
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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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