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Debt, cash and cash equivalents and lease liabilities - Summary of Debt by Interest Rate (Details) - EUR (€) € in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Cash and cash equivalents | € (8,710) | € (12,736) | € (10,098) | € (13,915)
Net debt | 7,793 | € 6,437 | € 9,983 |
Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | € 16,591 |  |  |
Debt, percent | 100.00% | 100.00% |  |
Net debt | € 7,881 |  |  |
Value on redemption before derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | € 16,080 |  |  |
Debt, percent | 97.00% |  |  |
Value on redemption before derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | € 511 |  |  |
Debt, percent | 3.00% |  |  |
Cash and cash equivalents | € (8,710) |  |  |
Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 16,573 |  |  |
Debt, percent |  | 100.00% | 100.00% |
Cash and cash equivalents | (8,738) | € (12,781) | € (10,267) |
Net debt | 7,835 | € 6,492 | € 10,047 |
Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | € 11,382 |  |  |
Debt, percent | 69.00% | 85.00% | 87.00% |
Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | € 5,191 |  |  |
Debt, percent | 31.00% | 15.00% | 13.00% |
Year 1 | Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | € 2,045 |  |  |
Net debt | (6,665) |  |  |
Year 1 | Value on redemption before derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,664 |  |  |
Year 1 | Value on redemption before derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 381 |  |  |
Cash and cash equivalents | (8,710) |  |  |
Year 1 | Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 2,027 |  |  |
Net debt | (6,711) |  |  |
Year 1 | Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | (3,034) |  |  |
Year 1 | Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 5,061 |  |  |
Year 2 | Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 2,698 |  |  |
Net debt | 2,698 |  |  |
Year 2 | Value on redemption before derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 2,600 |  |  |
Year 2 | Value on redemption before derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 98 |  |  |
Cash and cash equivalents | 0 |  |  |
Year 2 | Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 2,698 |  |  |
Net debt | 2,698 |  |  |
Year 2 | Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 2,600 |  |  |
Year 2 | Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 98 |  |  |
Year 3 | Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 3,011 |  |  |
Net debt | 3,011 |  |  |
Year 3 | Value on redemption before derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 3,010 |  |  |
Year 3 | Value on redemption before derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1 |  |  |
Cash and cash equivalents | 0 |  |  |
Year 3 | Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 3,011 |  |  |
Net debt | 3,011 |  |  |
Year 3 | Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 3,010 |  |  |
Year 3 | Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1 |  |  |
Year 4 | Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,151 |  |  |
Net debt | 1,151 |  |  |
Year 4 | Value on redemption before derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,150 |  |  |
Year 4 | Value on redemption before derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1 |  |  |
Cash and cash equivalents | 0 |  |  |
Year 4 | Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,151 |  |  |
Net debt | 1,151 |  |  |
Year 4 | Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,150 |  |  |
Year 4 | Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1 |  |  |
Year 5 | Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,607 |  |  |
Net debt | 1,607 |  |  |
Year 5 | Value on redemption before derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,606 |  |  |
Year 5 | Value on redemption before derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1 |  |  |
Cash and cash equivalents | 0 |  |  |
Year 5 | Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,607 |  |  |
Net debt | 1,607 |  |  |
Year 5 | Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,606 |  |  |
Year 5 | Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1 |  |  |
Year 5 and later | Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 6,079 |  |  |
Net debt | 6,079 |  |  |
Year 5 and later | Value on redemption before derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 6,050 |  |  |
Year 5 and later | Value on redemption before derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 29 |  |  |
Cash and cash equivalents | 0 |  |  |
Year 5 and later | Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 6,079 |  |  |
Net debt | 6,079 |  |  |
Year 5 and later | Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 6,050 |  |  |
Year 5 and later | Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 29 |  |  |
Euro | Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Net debt | 10,113 |  |  |
Euro | Value on redemption before derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 14,228 |  |  |
Euro | Value on redemption before derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 0 |  |  |
Cash and cash equivalents | (4,115) |  |  |
Euro | Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Net debt | 6,852 | € 10,489 | € 13,129 |
Euro | Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 11,382 |  |  |
Euro | Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 113 |  |  |
Cash and cash equivalents | (4,642) |  |  |
US dollar | Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Net debt | (2,376) |  |  |
US dollar | Value on redemption before derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 1,852 |  |  |
US dollar | Value on redemption before derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 24 |  |  |
Cash and cash equivalents | (4,251) |  |  |
US dollar | Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Net debt | 1,169 | € (2,404) | € (669) |
US dollar | Value on redemption after derivative instruments | Fixed-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 0 |  |  |
US dollar | Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Debt | 3,300 |  |  |
Cash and cash equivalents | (2,132) |  |  |
Singapore dollar | Value on redemption before derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Net debt | (3) |  |  |
Singapore dollar | Value on redemption after derivative instruments |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Net debt | (1,143) |  |  |
Singapore dollar | Value on redemption after derivative instruments | Floating-rate debt |  |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |  |
Cash and cash equivalents | € (1,143) |  |  |

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