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Share-based compensation - Text Details (Detail)
12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Share-based compensation - Text Details (Detail) [Line Items]                
Share-based compensation costs € 102,000,000   € 122,000,000 € 95,000,000        
Employee stock purchase plan 5,000,000              
Expense from share-based payment transactions with employees € 107,000,000              
Comparison group for performance shares 20 20 20   21      
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested € 15,000,000   € 29,000,000 20,000,000        
Euro [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Weighted average remaining contractual life of outstanding share options 2.3         2.3    
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested € 19,800,000              
US Dollar [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Weighted average remaining contractual life of outstanding share options 2.3         2.3    
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested € 14,700,000              
former Philips employees now employed by Signify [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Expense from share-based payment transactions with employees € 10,000,000              
Accelerate options [Member] | Euro [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Weighted average remaining contractual life of outstanding share options 3.3         3.3    
Aggregate intrinsic value of liabilities from share-pased payments € 4,300,000              
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested 4,000,000   6,000,000          
Proceeds from exercise of options 4,000,000   8,000,000          
Tax deductions realized as a result of option exercises € 200,000   300,000          
Accelerate options [Member] | US Dollar [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Exercise price of outstanding share options | $           $ 20.02    
Weighted average remaining contractual life of outstanding share options 3.1         3.1    
Aggregate intrinsic value of liabilities from share-pased payments | $   $ 1,900,000            
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested | $           $ 1,000,000 $ 1,000,000  
Option plans [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Weighted average remaining contractual life of outstanding share options 2.3         2.3    
Aggregate intrinsic value of liabilities from share-pased payments € 20,000,000              
Option plans [Member] | Euro [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Proceeds from exercise of options 57,000,000   128,000,000 65,000,000        
Tax deductions realized as a result of option exercises € 3,000,000   € 5,000,000 € 2,000,000        
Option plans [Member] | US Dollar [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Weighted average remaining contractual life of outstanding share options 2.3         2.3    
Aggregate intrinsic value of liabilities from share-pased payments | $   $ 15,000,000            
Intrinsic value of liabilities from share-based payment transactions for which counterparty's right to cash or other assets vested | $           $ 16,000,000 $ 22,000,000 $ 6,000,000
Option plans [Member] | Bottom of range [member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Exercise price of outstanding share options | $           16.76    
Option plans [Member] | Top of range [member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Exercise price of outstanding share options | $           $ 36.63    
Performance share plans [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Risk free interest rate, share options granted (0.47%) (0.47%)            
Expected volatility, share options granted 22.00% 22.00%            
Unrecognized compensation costs related to non-vested shares € 111,000,000              
Cost recognition period (weighted average) 1.85 1.85            
Restricted shares [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Unrecognized compensation costs related to non-vested shares € 59,000,000              
Cost recognition period (weighted average) 1.83 1.83            
Cliff-vesting period 3         3    
Bottom of range [member] | Accelerate options [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Exercise price of outstanding share options € 15.24              
Bottom of range [member] | Option plans [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Exercise price of outstanding share options 12.63              
Top of range [member] | Accelerate options [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Exercise price of outstanding share options 22.43              
Top of range [member] | Option plans [Member]                
Share-based compensation - Text Details (Detail) [Line Items]                
Exercise price of outstanding share options € 24.90