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Equity - Reserves for Other Comprehensive Income (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Reserves within equity |  |
Balance | € 55,230 | € 44,519
Balance | 53,644 | 55,230
Reserve for OCI on cash flow hedge derivatives |  |
Reserves within equity |  |
Balance | (342) | (896)
Changes of the year | 73 | (2,750)
Reversal to inventories adjustments | (5) | (6)
Reclassification adjustments | 310 | 3,310
Balance | 36 | (342)
Reserve for OCI on cash flow hedge derivatives | Gross reserve |  |
Reserves within equity |  |
Balance | (483) | (1,269)
Changes of the year | 105 | (3,883)
Reversal to inventories adjustments | (8) | (8)
Reclassification adjustments | 436 | 4,677
Balance | 50 | (483)
Reserve for OCI on cash flow hedge derivatives | Deferred tax liabilities, gross |  |
Reserves within equity |  |
Balance | 141 | 373
Changes of the year | (32) | 1,133
Reversal to inventories adjustments | 3 | 2
Reclassification adjustments | (126) | (1,367)
Balance | (14) | 141
Reserve for OCI on defined benefit plans |  |
Reserves within equity |  |
Balance | (58) | (117)
Changes of the year | (21) | 55
Currency translation differences | (9) | 1
Changes in scope of consolidation |  | 3
Balance | (88) | (58)
OCI relating to equity-accounted investments | 1 | 1
Reserve for OCI on defined benefit plans | Gross reserve |  |
Reserves within equity |  |
Balance | (20) | (84)
Changes of the year | (31) | 60
Currency translation differences | (43) | 1
Changes in scope of consolidation |  | 3
Balance | (94) | (20)
Reserve for OCI on defined benefit plans | Deferred tax liabilities, gross |  |
Reserves within equity |  |
Balance | (38) | (33)
Changes of the year | 10 | (5)
Currency translation differences | 34 |
Balance | 6 | (38)
Reserve for OCI on equity-accounted investments |  |
Reserves within equity |  |
Balance | 46 | 54
Changes of the year | 52 | 92
Changes in scope of consolidation |  | 1
Reclassification adjustments |  | (101)
Balance | 98 | 46
Reserve for OCI on Investments fair value |  |
Reserves within equity |  |
Balance | 53 | 141
Changes of the year | 45 | 56
Reclassification to retained earnings |  | (144)
Balance | € 98 | € 53

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