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Derivative Financial Instruments - Disclosure of Instruments (Details)
€ in Millions
Jun. 30, 2023
EUR (€)
Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 4,136
Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 4,136
Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
Notional amount | 2023  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 995
Notional amount | 2024  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 724
Notional amount | 2025  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 850
Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
Notional amount | 2027 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 1,566
Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (239)
Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (239)
Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 0
pay capitalized SOFR USD / receive 1.03%  
Disclosure of detailed information about financial instruments [line items]  
Interest rate 1.03%
pay capitalized SOFR USD / receive 1.03% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 458
pay capitalized SOFR USD / receive 1.03% | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 458
pay capitalized SOFR USD / receive 1.03% | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.03% | Notional amount | 2023  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.03% | Notional amount | 2024  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.03% | Notional amount | 2025  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.03% | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.03% | Notional amount | 2027 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 458
pay capitalized SOFR USD / receive 1.03% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (60)
pay capitalized SOFR USD / receive 1.03% | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (60)
pay capitalized SOFR USD / receive 1.03% | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.03% | Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 0
pay capitalized SOFR USD / receive 1.32%  
Disclosure of detailed information about financial instruments [line items]  
Interest rate 1.32%
pay capitalized SOFR USD / receive 1.32% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 458
pay capitalized SOFR USD / receive 1.32% | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 458
pay capitalized SOFR USD / receive 1.32% | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.32% | Notional amount | 2023  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.32% | Notional amount | 2024  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.32% | Notional amount | 2025  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.32% | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.32% | Notional amount | 2027 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 458
pay capitalized SOFR USD / receive 1.32% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (54)
pay capitalized SOFR USD / receive 1.32% | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (54)
pay capitalized SOFR USD / receive 1.32% | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD / receive 1.32% | Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 0
pay capitalized Ester / receive 0.69%  
Disclosure of detailed information about financial instruments [line items]  
Interest rate 0.69%
pay capitalized Ester / receive 0.69% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 850
pay capitalized Ester / receive 0.69% | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 850
pay capitalized Ester / receive 0.69% | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.69% | Notional amount | 2023  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.69% | Notional amount | 2024  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.69% | Notional amount | 2025  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 850
pay capitalized Ester / receive 0.69% | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.69% | Notional amount | 2027 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.69% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (49)
pay capitalized Ester / receive 0.69% | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (49)
pay capitalized Ester / receive 0.69% | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.69% | Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 0
pay capitalized Ester / receive 0.92%  
Disclosure of detailed information about financial instruments [line items]  
Interest rate 0.92%
pay capitalized Ester / receive 0.92% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 650
pay capitalized Ester / receive 0.92% | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 650
pay capitalized Ester / receive 0.92% | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.92% | Notional amount | 2023  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.92% | Notional amount | 2024  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.92% | Notional amount | 2025  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.92% | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.92% | Notional amount | 2027 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 650
pay capitalized Ester / receive 0.92% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (74)
pay capitalized Ester / receive 0.92% | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (74)
pay capitalized Ester / receive 0.92% | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 0.92% | Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 0
pay capitalized Ester / receive 3.43%  
Disclosure of detailed information about financial instruments [line items]  
Interest rate 3.43%
pay capitalized Ester / receive 3.43% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 1,720
pay capitalized Ester / receive 3.43% | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 1,720
pay capitalized Ester / receive 3.43% | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 3.43% | Notional amount | 2023  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 995
pay capitalized Ester / receive 3.43% | Notional amount | 2024  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 724
pay capitalized Ester / receive 3.43% | Notional amount | 2025  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 3.43% | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 3.43% | Notional amount | 2027 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 3.43% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (1)
pay capitalized Ester / receive 3.43% | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (1)
pay capitalized Ester / receive 3.43% | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 3.43% | Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 0