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Goodwill and intangible assets (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of reconciliation of changes in intangible assets and goodwill [abstract]  
Summary of Goodwill and Intangible Assets
Internal
development
costs and
patents		Acquired
intangible
assets		TotalGoodwillTotal
(in € millions)
Cost
At January 1, 201926 21 47 146 193 
Additions19 — 19 — 19 
Acquisition, business combination (Note 5)— 27 27 328 355 
Exchange differences— (1)(1)4 3 
At December 31, 201945 47 92 478 570 
Additions19 — 19 — 19 
Acquisition, business combination (Note 5)— 48 48 304 352 
Exchange differences— (4)(4)(46)(50)
At December 31, 202064 91 155 736 891 
Accumulated amortization
At January 1, 2019(12)(7)(19)— (19)
Amortization charge(7)(9)(16)— (16)
Exchange differences— 1 1 — 1 
At December 31, 2019(19)(15)(34)— (34)
Amortization charge(12)(13)(25)— (25)
Exchange differences— 1 1 — 1 
At December 31, 2020(31)(27)(58)— (58)
Cost, net accumulated amortization
At December 31, 201926 32 58 478 536 
At December 31, 202033 64 97 736 833 
Schedule of Carrying Amount of Goodwill Allocated to Each of the Operating Segments The carrying amount of goodwill allocated to each of the operating segments is as follows:
PremiumAd-SupportedPremiumAd-Supported
2020202020192019
(in € millions)
Goodwill125 611 130 348