Leases - Summary of Roll-forward of Lease Right-of-use Assets (Details) € in Millions |
12 Months Ended |
|---|---|
|
Dec. 31, 2019
EUR (€)
| |
| Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] | |
| Beginning balance | € 0 |
| Ending balance | 489 |
| Adoption of IFRS 16 | |
| Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] | |
| Beginning balance | 396 |
| Cost | |
| Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] | |
| Beginning balance | 471 |
| Increases | 138 |
| Acquired in business combinations | 11 |
| Decreases | (39) |
| Exchange differences | 6 |
| Ending balance | 587 |
| Accumulated Depreciation | |
| Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] | |
| Beginning balance | (75) |
| Decreases | 21 |
| Exchange differences | (2) |
| Ending balance | (98) |
| Depreciation charge | € (42) |