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Property, plant and equipment - Property, plant and equipment (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period € 1,712 [1] € 1,591
IFRS 16 adjustment [2] (33)  
Additions other than through business combinations, property, plant and equipment   546
Assets available for use 1 0
Acquisitions through business combinations, property, plant and equipment   2
Depreciation, property, plant and equipment   409
Impairment loss recognised in profit or loss, property, plant and equipment   30
Reclassifications (1) 0
Increase (decrease) through net exchange differences, property, plant and equipment   13
Total increase (decrease) in property, plant and equipment   121
Property, plant and equipment at end of period [1] 2,866 1,712
IFRS 16 [Member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 760  
Property, plant and equipment at end of period   760
Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,712  
IFRS 16 adjustment (334)  
Additions other than through business combinations, property, plant and equipment 505  
Assets available for use (9)  
Acquisitions through business combinations, property, plant and equipment 28  
Depreciation, property, plant and equipment 310  
Impairment loss recognised in profit or loss, property, plant and equipment 40  
Reclassifications (99)  
Increase (decrease) through net exchange differences, property, plant and equipment 31  
Total increase (decrease) in property, plant and equipment 105  
Property, plant and equipment at end of period 1,483 1,712
Owned [member] | IFRS 16 [Member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,378  
Property, plant and equipment at end of period   1,378
Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,094  
Additions other than through business combinations, property, plant and equipment 532  
Assets available for use 7  
Depreciation, property, plant and equipment 293  
Impairment loss recognised in profit or loss, property, plant and equipment 2  
Reclassifications 68  
Increase (decrease) through net exchange differences, property, plant and equipment (23)  
Total increase (decrease) in property, plant and equipment 289  
Property, plant and equipment at end of period 1,383 1,094
Construction in progress [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 203 140
Additions other than through business combinations, property, plant and equipment   337
Assets available for use   (275)
Total increase (decrease) in property, plant and equipment   63
Property, plant and equipment at end of period   203
Construction in progress [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 203  
Additions other than through business combinations, property, plant and equipment 425  
Assets available for use (306)  
Acquisitions through business combinations, property, plant and equipment 1  
Impairment loss recognised in profit or loss, property, plant and equipment (0)  
Reclassifications 1  
Increase (decrease) through net exchange differences, property, plant and equipment 0  
Total increase (decrease) in property, plant and equipment 120  
Property, plant and equipment at end of period 323 203
Construction in progress [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Additions other than through business combinations, property, plant and equipment 3  
Assets available for use (3)  
Impairment loss recognised in profit or loss, property, plant and equipment 0  
Reclassifications 1  
Increase (decrease) through net exchange differences, property, plant and equipment 0  
Total increase (decrease) in property, plant and equipment 1  
Property, plant and equipment at end of period 1  
Land and buildings [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 621 584
Additions other than through business combinations, property, plant and equipment   20
Assets available for use   68
Acquisitions through business combinations, property, plant and equipment   0
Depreciation, property, plant and equipment   56
Impairment loss recognised in profit or loss, property, plant and equipment   5
Increase (decrease) through net exchange differences, property, plant and equipment   11
Total increase (decrease) in property, plant and equipment   37
Property, plant and equipment at end of period   621
Land and buildings [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 621  
IFRS 16 adjustment (80)  
Additions other than through business combinations, property, plant and equipment 5  
Assets available for use 51  
Depreciation, property, plant and equipment 30  
Impairment loss recognised in profit or loss, property, plant and equipment 17  
Reclassifications (74)  
Increase (decrease) through net exchange differences, property, plant and equipment 4  
Total increase (decrease) in property, plant and equipment (61)  
Property, plant and equipment at end of period 481 621
Land and buildings [member] | Owned [member] | IFRS 16 [Member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 541  
Property, plant and equipment at end of period   541
Land and buildings [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 769  
IFRS 16 adjustment 769  
Additions other than through business combinations, property, plant and equipment 373  
Assets available for use 6  
Depreciation, property, plant and equipment 157  
Impairment loss recognised in profit or loss, property, plant and equipment 1  
Reclassifications 47  
Increase (decrease) through net exchange differences, property, plant and equipment (9)  
Total increase (decrease) in property, plant and equipment 260  
Property, plant and equipment at end of period 1,029 769
Machinery [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 504 491
Additions other than through business combinations, property, plant and equipment   126
Assets available for use   99
Acquisitions through business combinations, property, plant and equipment   (5)
Depreciation, property, plant and equipment   191
Impairment loss recognised in profit or loss, property, plant and equipment   13
Increase (decrease) through net exchange differences, property, plant and equipment   (2)
Total increase (decrease) in property, plant and equipment 11 13
Property, plant and equipment at end of period   504
Machinery [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 504  
IFRS 16 adjustment (209)  
Additions other than through business combinations, property, plant and equipment 34  
Assets available for use 108  
Acquisitions through business combinations, property, plant and equipment 0  
Depreciation, property, plant and equipment 123  
Impairment loss recognised in profit or loss, property, plant and equipment 14  
Reclassifications 5  
Increase (decrease) through net exchange differences, property, plant and equipment 9  
Total increase (decrease) in property, plant and equipment 19  
Property, plant and equipment at end of period 314 504
Machinery [member] | Owned [member] | IFRS 16 [Member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 295  
Property, plant and equipment at end of period   295
Machinery [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 209  
IFRS 16 adjustment 209  
Additions other than through business combinations, property, plant and equipment 96  
Depreciation, property, plant and equipment 80  
Impairment loss recognised in profit or loss, property, plant and equipment 1  
Total increase (decrease) in property, plant and equipment 16  
Property, plant and equipment at end of period 225 209
Other equipment [Member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 383 376
Additions other than through business combinations, property, plant and equipment   64
Assets available for use   108
Acquisitions through business combinations, property, plant and equipment   7
Depreciation, property, plant and equipment   162
Impairment loss recognised in profit or loss, property, plant and equipment   12
Increase (decrease) through net exchange differences, property, plant and equipment   4
Total increase (decrease) in property, plant and equipment   7
Property, plant and equipment at end of period   383
Other equipment [Member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 383  
IFRS 16 adjustment (45)  
Additions other than through business combinations, property, plant and equipment 40  
Assets available for use 138  
Acquisitions through business combinations, property, plant and equipment 27  
Depreciation, property, plant and equipment 157  
Impairment loss recognised in profit or loss, property, plant and equipment 9  
Reclassifications (30)  
Increase (decrease) through net exchange differences, property, plant and equipment 18  
Total increase (decrease) in property, plant and equipment 26  
Property, plant and equipment at end of period 365 383
Other equipment [Member] | Owned [member] | IFRS 16 [Member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 338  
Property, plant and equipment at end of period   338
Other equipment [Member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 116  
IFRS 16 adjustment 116  
Additions other than through business combinations, property, plant and equipment 59  
Assets available for use 4  
Depreciation, property, plant and equipment 57  
Impairment loss recognised in profit or loss, property, plant and equipment 1  
Reclassifications 20  
Increase (decrease) through net exchange differences, property, plant and equipment (14)  
Property, plant and equipment at end of period 127 116
Power generating assets [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
IFRS 16 adjustment 1,094  
Accumulated depreciation, amortisation and impairment [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at end of period (2,536)  
Accumulated depreciation, amortisation and impairment [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period (286)  
Property, plant and equipment at end of period (716) (286)
Accumulated depreciation, amortisation and impairment [member] | Land and buildings [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period (528)  
Property, plant and equipment at end of period (395) (528)
Accumulated depreciation, amortisation and impairment [member] | Land and buildings [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period (44)  
Property, plant and equipment at end of period (326) (44)
Accumulated depreciation, amortisation and impairment [member] | Machinery [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period (958)  
Property, plant and equipment at end of period (957) (958)
Accumulated depreciation, amortisation and impairment [member] | Machinery [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period (206)  
Property, plant and equipment at end of period (285) (206)
Accumulated depreciation, amortisation and impairment [member] | Office equipment [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period (36)  
Property, plant and equipment at end of period   (36)
Accumulated depreciation, amortisation and impairment [member] | Other equipment [Member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period (1,104)  
Property, plant and equipment at end of period (1,184) (1,104)
Accumulated depreciation, amortisation and impairment [member] | Other equipment [Member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at end of period (105)  
Accumulated depreciation and amortisation [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 2,876 2,818
Property, plant and equipment at end of period   2,876
Accumulated depreciation and amortisation [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period (2,590)  
Property, plant and equipment at end of period   (2,590)
Accumulated depreciation and amortisation [member] | Land and buildings [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 572 527
Property, plant and equipment at end of period   572
Accumulated depreciation and amortisation [member] | Machinery [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,164 1,217
Property, plant and equipment at end of period   1,164
Accumulated depreciation and amortisation [member] | Other equipment [Member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,140 1,074
Property, plant and equipment at end of period   1,140
Gross carrying amount [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 4,588 4,408
Property, plant and equipment at end of period   4,588
Gross carrying amount [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 3,967  
Property, plant and equipment at end of period 4,019 3,967
Gross carrying amount [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,381  
Property, plant and equipment at end of period 2,099 1,381
Gross carrying amount [member] | Construction in progress [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 203 140
Property, plant and equipment at end of period   203
Gross carrying amount [member] | Construction in progress [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 203  
Property, plant and equipment at end of period 323 203
Gross carrying amount [member] | Construction in progress [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at end of period 1  
Gross carrying amount [member] | Land and buildings [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,193 1,111
Property, plant and equipment at end of period   1,193
Gross carrying amount [member] | Land and buildings [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,069  
Property, plant and equipment at end of period 876 1,069
Gross carrying amount [member] | Land and buildings [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 813  
Property, plant and equipment at end of period 1,355 813
Gross carrying amount [member] | Machinery [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,669 1,708
Property, plant and equipment at end of period   1,669
Gross carrying amount [member] | Machinery [member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,253  
Property, plant and equipment at end of period 1,272 1,253
Gross carrying amount [member] | Machinery [member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 415  
Property, plant and equipment at end of period 510 415
Gross carrying amount [member] | Other equipment [Member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,523 1,449
Property, plant and equipment at end of period   1,523
Gross carrying amount [member] | Other equipment [Member] | Owned [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 1,442  
Property, plant and equipment at end of period 1,548 1,442
Gross carrying amount [member] | Other equipment [Member] | Right-of-use assets [member]    
Property, plant and equipment - Text Details (Detail) [Line Items]    
Property, plant and equipment at beginning of period 152  
Property, plant and equipment at end of period € 233 € 152
[1] Includes the impact of IFRS 16 lease accounting following its adoption as of January 1, 2019. For more details refer to the Significant accounting policies
[2] Impact of IFRS 16 adoption. Reference is made to the Significant accounting policies