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Share-Based Compensation Long Term Incentive Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 26, 2018
Apr. 25, 2018
Apr. 27, 2017
Apr. 26, 2017
Apr. 28, 2016
Feb. 28, 2018
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Feb. 28, 2014
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Apr. 23, 2015
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 [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Performance-Based Awards Payout % Range                       0.00%    
PLC Long Term Incentive Plan | Maximum [Member]                            
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                       750,000    
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                  
Grant Date Fair Value $ 2   $ 2   $ 2                  
RSU's Issued in Period, Gross   24,642   26,580                    
Fair Value of RSUs Vested in Period   $ 2   $ 2                    
RSU's, Used to Pay Witholding Taxes   (2,649)   (3,472)                    
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                            
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                            
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              
Fair Value of RSUs Vested in Period           $ 26 $ 19              
RSU's, Used to Pay Witholding Taxes           102,045 88,807              
PLC Long Term Incentive Plan | Restricted Stock Units (RSUs) | Executives | Performance-Based | 2014 Grant                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
RSU's Issued in Period, Gross                         797,210  
Fair Value of RSUs Vested in Period                         $ 60  
RSU's, Used to Pay Witholding Taxes                         324,555  
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 RSUs Vested in Period                       $ 59    
RSU's, Used to Pay Witholding Taxes                       240,483