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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
 [1]
Disclosure of financial instruments by type of interest rate [line items]        
Cash and cash equivalents € (12,736) € (10,098) € (13,915) [1],[2] € (9,427)
Net debt 6,437 € 9,983 € 8,790  
Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt € 19,321      
Debt, percent 100.00%      
Net debt € 6,585      
Value on redemption before derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt € 18,861      
Debt, percent 98.00%      
Value on redemption before derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt € 460      
Debt, percent 2.00%      
Cash and cash equivalents € (12,736)      
Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 19,273      
Debt, percent   100.00% 100.00%  
Cash and cash equivalents (12,781) € (10,267) € (13,841)  
Net debt 6,492 € 10,047 € 8,862  
Value on redemption after derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt € 16,386      
Debt, percent 85.00% 87.00% 91.00%  
Value on redemption after derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt € 2,886      
Debt, percent 15.00% 13.00% 9.00%  
Year 1 | Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt € 4,178      
Net debt (8,558)      
Year 1 | Value on redemption before derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 3,817      
Year 1 | Value on redemption before derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 361      
Cash and cash equivalents (12,736)      
Year 1 | Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 4,130      
Cash and cash equivalents (12,781)      
Net debt (8,651)      
Year 1 | Value on redemption after derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 1,342      
Year 1 | Value on redemption after derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 2,787      
Year 2 | Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 661      
Net debt 661      
Year 2 | Value on redemption before derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 600      
Year 2 | Value on redemption before derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 61      
Year 2 | Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 661      
Net debt 661      
Year 2 | Value on redemption after derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 600      
Year 2 | Value on redemption after derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 61      
Year 3 | Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 2,600      
Net debt 2,600      
Year 3 | Value on redemption before derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 2,600      
Year 3 | Value on redemption before derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Year 3 | Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 2,600      
Net debt 2,600      
Year 3 | Value on redemption after derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 2,600      
Year 3 | Value on redemption after derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Year 4 | Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 4,160      
Net debt 4,160      
Year 4 | Value on redemption before derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 4,160      
Year 4 | Value on redemption before derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Year 4 | Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 4,160      
Net debt 4,160      
Year 4 | Value on redemption after derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 4,160      
Year 4 | Value on redemption after derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Year 5 | Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Net debt 0      
Year 5 | Value on redemption before derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Year 5 | Value on redemption before derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Year 5 | Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Net debt 0      
Year 5 | Value on redemption after derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Year 5 | Value on redemption after derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 0      
Year 5 and later | Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 7,722      
Net debt 7,722      
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 7,684      
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 38      
Year 5 and later | Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 7,722      
Net debt 7,722      
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 7,684      
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 38      
Euro | Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Net debt 13,145      
Euro | Value on redemption before derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 16,993      
Euro | Value on redemption before derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 60      
Cash and cash equivalents (3,908)      
Euro | Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Net debt 10,489 € 13,129 € 13,725  
Euro | Value on redemption after derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 13,944      
Euro | Value on redemption after derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 592      
Cash and cash equivalents (4,046)      
US dollar | Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Net debt (6,508)      
US dollar | Value on redemption before derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 1,868      
US dollar | Value on redemption before derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 15      
Cash and cash equivalents (8,391)      
US dollar | Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Net debt (2,404) € (669) € (3,304)  
US dollar | Value on redemption after derivative instruments | Fixed-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 2,443      
US dollar | Value on redemption after derivative instruments | Floating-rate debt        
Disclosure of financial instruments by type of interest rate [line items]        
Debt 950      
Cash and cash equivalents (5,797)      
Singapore dollar | Value on redemption before derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Net debt 0      
Singapore dollar | Value on redemption after derivative instruments        
Disclosure of financial instruments by type of interest rate [line items]        
Net debt (2,155)      
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 € (2,155)      
[1] (j)    Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.
[2] Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.