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Intangible assets excluding goodwill - Intangible assets excluding goodwill (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period € 3,322 € 3,552
Purchases Intangible assets other than goodwill 205 261
Internally generated intangible assets other than goodwill 203 189
Acquisitions through business combinations, intangible assets other than goodwill   926
Amortisation, intangible assets other than goodwill 415 (550)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (549) (83)
Increase (decrease) through net exchange differences, intangible assets other than goodwill 94 (252)
Increase (decrease) in intangible assets other than goodwill 267 (230)
Assets available for use 0 0
Decrease through classified as held for sale, intangible assets other than goodwill   (721)
Intangible assets other than goodwill at end of period 3,589 3,322
Brand names [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 278 455
Acquisitions through business combinations, intangible assets other than goodwill   7
Amortisation, intangible assets other than goodwill 11 (40)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (52)  
Increase (decrease) through net exchange differences, intangible assets other than goodwill 3 (24)
Increase (decrease) in intangible assets other than goodwill (72) (178)
Decrease through classified as held for sale, intangible assets other than goodwill   (120)
Intangible assets other than goodwill at end of period 205 278
Computer software [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 174 159
Purchases Intangible assets other than goodwill 92 86
Acquisitions through business combinations, intangible assets other than goodwill   2
Amortisation, intangible assets other than goodwill 0 (52)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (59) (1)
Increase (decrease) through net exchange differences, intangible assets other than goodwill 2 (1)
Increase (decrease) in intangible assets other than goodwill 30 15
Decrease through classified as held for sale, intangible assets other than goodwill   (19)
Intangible assets other than goodwill at end of period 204 174
Customer-related intangible assets [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 1,004 1,241
Purchases Intangible assets other than goodwill 7 0
Acquisitions through business combinations, intangible assets other than goodwill   431
Amortisation, intangible assets other than goodwill 17 (142)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (114)  
Increase (decrease) through net exchange differences, intangible assets other than goodwill 36 (89)
Increase (decrease) in intangible assets other than goodwill (70) (238)
Decrease through classified as held for sale, intangible assets other than goodwill   (438)
Intangible assets other than goodwill at end of period 934 1,004
Other intangible assets [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 21 34
Purchases Intangible assets other than goodwill 1 3
Acquisitions through business combinations, intangible assets other than goodwill   16
Amortisation, intangible assets other than goodwill 56 (3)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (4)  
Increase (decrease) through net exchange differences, intangible assets other than goodwill 3 (23)
Increase (decrease) in intangible assets other than goodwill 53 (13)
Decrease through classified as held for sale, intangible assets other than goodwill   (6)
Intangible assets other than goodwill at end of period 75 21
Product development construction in progress [Member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 436 542
Purchases Intangible assets other than goodwill 92 149
Internally generated intangible assets other than goodwill 203 189
Acquisitions through business combinations, intangible assets other than goodwill (256)  
Amortisation, intangible assets other than goodwill   0
Impairment loss recognised in profit or loss, intangible assets other than goodwill   (27)
Increase (decrease) through net exchange differences, intangible assets other than goodwill 8 (43)
Increase (decrease) in intangible assets other than goodwill 45 (106)
Assets available for use   (363)
Decrease through classified as held for sale, intangible assets other than goodwill   (11)
Intangible assets other than goodwill at end of period 481 436
Product development [Member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 586 537
Acquisitions through business combinations, intangible assets other than goodwill 256  
Amortisation, intangible assets other than goodwill   (213)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (221) (43)
Increase (decrease) through net exchange differences, intangible assets other than goodwill 15 (35)
Increase (decrease) in intangible assets other than goodwill 34 49
Assets available for use   363
Decrease through classified as held for sale, intangible assets other than goodwill   (23)
Intangible assets other than goodwill at end of period 621 586
Technology-based intangible assets [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 824 583
Purchases Intangible assets other than goodwill 14 23
Acquisitions through business combinations, intangible assets other than goodwill   470
Amortisation, intangible assets other than goodwill 330 (100)
Impairment loss recognised in profit or loss, intangible assets other than goodwill (116) (12)
Increase (decrease) through net exchange differences, intangible assets other than goodwill 27 (37)
Increase (decrease) in intangible assets other than goodwill 246 241
Decrease through classified as held for sale, intangible assets other than goodwill   (103)
Intangible assets other than goodwill at end of period 1,070 824
Accumulated depreciation, amortisation and impairment [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period (4,720) (6,230)
Intangible assets other than goodwill at end of period (5,408) (4,720)
Accumulated depreciation, amortisation and impairment [member] | Brand names [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period (392) (633)
Intangible assets other than goodwill at end of period (484) (392)
Accumulated depreciation, amortisation and impairment [member] | Computer software [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period (431) (421)
Intangible assets other than goodwill at end of period (480) (431)
Accumulated depreciation, amortisation and impairment [member] | Customer-related intangible assets [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period (1,338) (2,188)
Intangible assets other than goodwill at end of period (1,488) (1,338)
Accumulated depreciation, amortisation and impairment [member] | Other intangible assets [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period (84) (99)
Intangible assets other than goodwill at end of period (93) (84)
Accumulated depreciation, amortisation and impairment [member] | Product development construction in progress [Member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period (51) (36)
Intangible assets other than goodwill at end of period (51) (51)
Accumulated depreciation, amortisation and impairment [member] | Product development [Member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period (1,262) (1,362)
Intangible assets other than goodwill at end of period (1,483) (1,262)
Accumulated depreciation, amortisation and impairment [member] | Technology-based intangible assets [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period (1,161) (1,491)
Intangible assets other than goodwill at end of period (1,330) (1,161)
Gross carrying amount [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 8,042 9,782
Intangible assets other than goodwill at end of period 8,997 8,042
Gross carrying amount [member] | Brand names [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 670 1,088
Intangible assets other than goodwill at end of period 689 670
Gross carrying amount [member] | Computer software [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 605 580
Intangible assets other than goodwill at end of period 684 605
Gross carrying amount [member] | Customer-related intangible assets [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 2,342 3,429
Intangible assets other than goodwill at end of period 2,421 2,342
Gross carrying amount [member] | Other intangible assets [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 105 134
Intangible assets other than goodwill at end of period 168 105
Gross carrying amount [member] | Product development construction in progress [Member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 487 578
Intangible assets other than goodwill at end of period 532 487
Gross carrying amount [member] | Product development [Member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 1,848 1,899
Intangible assets other than goodwill at end of period 2,103 1,848
Gross carrying amount [member] | Technology-based intangible assets [member]    
Intangible assets excluding goodwill - Text Details (Detail) [Line Items]    
Intangible assets other than goodwill at beginning of period 1,985 2,074
Intangible assets other than goodwill at end of period € 2,400 € 1,985