Leases - Summary of Maturity Analysis of Lease Liabilities (Details) - EUR (€) € in Millions |
Dec. 31, 2019 |
Jan. 01, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| Disclosure Of Lease Commitments I F R S16 Leases [Line Items] | |||
| Total lease commitments | € 985 | € 833 | |
| Impact of discounting remaining lease payments | (324) | 285 | |
| Lease incentives receivable | (32) | ||
| Total lease liabilities | 629 | 541 | |
| Lease liabilities included in the consolidated statement of financial position | |||
| Current | 7 | 20 | |
| Lease liabilities | 622 | 521 | € 0 |
| Total lease liabilities included in the consolidated statement of financial position at January 1, 2019 | 629 | € 541 | |
| Less Than One Year | |||
| Disclosure Of Lease Commitments I F R S16 Leases [Line Items] | |||
| Total lease commitments | 79 | ||
| One to Five Years | |||
| Disclosure Of Lease Commitments I F R S16 Leases [Line Items] | |||
| Total lease commitments | 317 | ||
| More Than Five Years | |||
| Disclosure Of Lease Commitments I F R S16 Leases [Line Items] | |||
| Total lease commitments | € 589 |