v3.26.1
Derivative financial instruments - Disclosure of Instruments (Details)
€ in Millions
Jun. 30, 2026
EUR (€)
Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 4,951
Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 3,226
Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 1,726
Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
Notional amount | 2027  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 1,288
Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 1,313
Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 1,400
Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 950
Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (52)
Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (62)
Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 10
Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 10
pay 2.08% / receive Euribor 3M | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 850
pay 2.08% / receive Euribor 3M | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 2.08% / receive Euribor 3M | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 850
pay 2.08% / receive Euribor 3M | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 2.08% / receive Euribor 3M | Notional amount | 2027  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 850
pay 2.08% / receive Euribor 3M | Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 2.08% / receive Euribor 3M | Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 2.08% / receive Euribor 3M | Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 2.08% / receive Euribor 3M | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (2)
pay 2.08% / receive Euribor 3M | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 2.08% / receive Euribor 3M | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (2)
pay 2.08% / receive Euribor 3M | Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (2)
pay 3.77% / receive capitalized SOFR + 46bps | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
pay 3.77% / receive capitalized SOFR + 46bps | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.77% / receive capitalized SOFR + 46bps | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
pay 3.77% / receive capitalized SOFR + 46bps | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.77% / receive capitalized SOFR + 46bps | Notional amount | 2027  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
pay 3.77% / receive capitalized SOFR + 46bps | Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.77% / receive capitalized SOFR + 46bps | Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.77% / receive capitalized SOFR + 46bps | Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.77% / receive capitalized SOFR + 46bps | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 4
pay 3.77% / receive capitalized SOFR + 46bps | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.77% / receive capitalized SOFR + 46bps | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 4
pay 3.77% / receive capitalized SOFR + 46bps | Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 4
pay capitalized SOFR USD/ receive 1.03% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
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 438
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 | 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  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD/ receive 1.03% | Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
pay capitalized SOFR USD/ receive 1.03% | Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD/ receive 1.03% | Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD/ receive 1.03% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (25)
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 (25)
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% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
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 438
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
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  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD/ receive 1.32% | Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
pay capitalized SOFR USD/ receive 1.32% | Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives
pay capitalized SOFR USD/ receive 1.32% | Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized SOFR USD/ receive 1.32% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (22)
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 (22)
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
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 3.82% / receive capitalized SOFR USD + 54 bps | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
pay 3.82% / receive capitalized SOFR USD + 54 bps | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.82% / receive capitalized SOFR USD + 54 bps | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
pay 3.82% / receive capitalized SOFR USD + 54 bps | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.82% / receive capitalized SOFR USD + 54 bps | Notional amount | 2027  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.82% / receive capitalized SOFR USD + 54 bps | Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 438
pay 3.82% / receive capitalized SOFR USD + 54 bps | Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.82% / receive capitalized SOFR USD + 54 bps | Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.82% / receive capitalized SOFR USD + 54 bps | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 7
pay 3.82% / receive capitalized SOFR USD + 54 bps | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay 3.82% / receive capitalized SOFR USD + 54 bps | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 7
pay 3.82% / receive capitalized SOFR USD + 54 bps | Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 7
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 | 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  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester/receive 0.92% | Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester/receive 0.92% | Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 650
pay capitalized Ester/receive 0.92% | Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester/receive 0.92% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives (28)
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 (28)
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 2.53% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 750
pay capitalized Ester / receive 2.53% | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 750
pay capitalized Ester / receive 2.53% | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.53% | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.53% | Notional amount | 2027  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.53% | Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.53% | Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 750
pay capitalized Ester / receive 2.53% | Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.53% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 2
pay capitalized Ester / receive 2.53% | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 2
pay capitalized Ester / receive 2.53% | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.53% | 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 2.71% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 475
pay capitalized Ester / receive 2.71% | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 475
pay capitalized Ester / receive 2.71% | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.71% | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.71% | Notional amount | 2027  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.71% | Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.71% | Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.71% | Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 475
pay capitalized Ester / receive 2.71% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 4
pay capitalized Ester / receive 2.71% | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 4
pay capitalized Ester / receive 2.71% | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.71% | 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 2.91% | Notional amount  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 475
pay capitalized Ester / receive 2.91% | Notional amount | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 475
pay capitalized Ester / receive 2.91% | Notional amount | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.91% | Notional amount | 2026  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.91% | Notional amount | 2027  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.91% | Notional amount | 2028  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.91% | Notional amount | 2029  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.91% | Notional amount | 2030 and beyond  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 475
pay capitalized Ester / receive 2.91% | Fair value  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 7
pay capitalized Ester / receive 2.91% | Fair value | Fair value hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 7
pay capitalized Ester / receive 2.91% | Fair value | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives 0
pay capitalized Ester / receive 2.91% | Value of hedge recognized in equity | Cash flow hedges  
Disclosure of detailed information about financial instruments [line items]  
Currency and interest rate derivatives € 0