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Cash flow statement supplementary information - Reconciliation of liabilities arising from financing activities (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Increase (decrease) through financing cash flows, liabilities arising from financing activities € (1,192) € (53) [1]
Bank borrowings [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period 190 1,470
Increase (decrease) through financing cash flows, liabilities arising from financing activities 21 (22) [1]
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities 0 (21)
Increase (decrease) through other changes, liabilities arising from financing activities 0 [2] 0
Increase (decrease) through transfer to liabilities directly associated with assets held for sale, liabilities arising from financing activities   (1,238)
Liabilities arising from financing activities at end of period 211 190
Bonds [Member] | Euro [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period 997  
Increase (decrease) through financing cash flows, liabilities arising from financing activities 990 997 [1]
Increase (decrease) through other changes, liabilities arising from financing activities 1 [2] 0
Liabilities arising from financing activities at end of period   997
Bonds [Member] | US Dollar [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period 2,137 3,608
Increase (decrease) through financing cash flows, liabilities arising from financing activities (866) (1,184) [1]
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities 31 (287)
Increase (decrease) through other changes, liabilities arising from financing activities 0 [2] 1
Liabilities arising from financing activities at end of period   2,137
Equity [member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period (1,500) (181)
Increase (decrease) through financing cash flows, liabilities arising from financing activities (1,351) 168 [1]
Increase (decrease) through other changes, liabilities arising from financing activities 1,558 [2] (1,487)
Liabilities arising from financing activities at end of period (1,293) (1,500)
EUR Bond [member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at end of period 1,988  
Forward contracts equity [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Increase (decrease) through other changes, liabilities arising from financing activities 124 [2],[3] (1,018) [4],[5]
Forward contracts long term [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period 970  
Increase (decrease) through other changes, liabilities arising from financing activities (163) [2],[3] 970 [4],[5]
Liabilities arising from financing activities at end of period 88 970
Forward contracts short term [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period 49  
Increase (decrease) through other changes, liabilities arising from financing activities 39 [2],[3] 49 [4],[5]
Liabilities arising from financing activities at end of period 894 49
Lease liabilities [member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period 281 279
Increase (decrease) through financing cash flows, liabilities arising from financing activities (18) 12 [1]
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities 13 (20)
Increase (decrease) through other changes, liabilities arising from financing activities 53 [2] 29
Increase (decrease) through transfer to liabilities directly associated with assets held for sale, liabilities arising from financing activities   (18)
Liabilities arising from financing activities at end of period 330 281
Long-term borrowings including current portion of long-term borrowings [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period [7] 4,595 [6] 5,396
Increase (decrease) through financing cash flows, liabilities arising from financing activities 126 [6] (327) [7]
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities [6] 45  
Increase (decrease) through other changes, liabilities arising from financing activities (109) [2],[6] 998 [4],[7]
Increase (decrease) through transfer to liabilities directly associated with assets held for sale, liabilities arising from financing activities [7]   (1,255)
Liabilities arising from financing activities at end of period [6] 4,657 4,595 [7]
Other long-term debt [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period 20 39
Increase (decrease) through financing cash flows, liabilities arising from financing activities (1) (20) [1]
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities 0 1
Increase (decrease) through other changes, liabilities arising from financing activities 0 [2] (1)
Increase (decrease) through transfer to liabilities directly associated with assets held for sale, liabilities arising from financing activities   0
Liabilities arising from financing activities at end of period 18 20
Other short-term loans [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period   2
Increase (decrease) through financing cash flows, liabilities arising from financing activities [1]   (1)
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities   0
Increase (decrease) through transfer to liabilities directly associated with assets held for sale, liabilities arising from financing activities   (2)
Sale of Lighting Shares Net of Costs [member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Increase (decrease) through financing cash flows, liabilities arising from financing activities [1]   1,060
Increase (decrease) through other changes, liabilities arising from financing activities   (1,060)
Short-term bank borrowings [Member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period 71 207
Increase (decrease) through financing cash flows, liabilities arising from financing activities 34 (3) [1]
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities (29) (49)
Increase (decrease) through transfer to liabilities directly associated with assets held for sale, liabilities arising from financing activities   (84)
Liabilities arising from financing activities at end of period 76 71
Short-term borrowings [member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period [7] 120 [6] 210
Increase (decrease) through financing cash flows, liabilities arising from financing activities 34 [6] (49) [7]
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities [6] (29)  
Increase (decrease) through other changes, liabilities arising from financing activities 39 [2],[6] 49 [4],[7]
Increase (decrease) through transfer to liabilities directly associated with assets held for sale, liabilities arising from financing activities [7]   (86)
Liabilities arising from financing activities at end of period [6] 164 120 [7]
Treasury shares [member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period (481) (181)
Increase (decrease) through financing cash flows, liabilities arising from financing activities (948) (414) [1]
Increase (decrease) through other changes, liabilities arising from financing activities [2]   1,030
Liabilities arising from financing activities at end of period (399) (481)
USD Bond [member]    
Cash flow statement supplementary information - Text Details (Detail) [Line Items]    
Liabilities arising from financing activities at beginning of period 2,137  
Liabilities arising from financing activities at end of period € 1,303 € 2,137
[1] Cash flow includes cash movements related to Lighting from January to April 2017, and therefore does not equal cash flow financing activities in the consolidated statements of cash flows.
[2] Besides non-cash, other includes interest paid on finance leases, which is part of cash flows from operating activities
[3] The forward contracts are related to the share buyback program and LTI plans
[4] Besides non-cash, other includes interest paid on finance leases, which is part of cash flows from operating activities
[5] The forward contracts are mainly related to the share buyback program
[6] Long-term debt includes the short-term portion of long-term debt, and short-term debt excludes the short-term portion of the long-term debt.
[7] Long-term debt includes the short-term portion of long-term debt, and short-term debt excluding the short-term portion of long-term debt.