To compute the Net Debt/EBITDA ratio for 2022 we first determine the figures for net debt and EBITDA using the data provided.

**1. EBITDA (2022)**  
The “Gross Operating Income EBITDA” for the period 2022‑01‑01 – 2023‑01‑01 is €1,505 million.

**2. Net Debt (2022‑end)**  
Net Debt is calculated as total financial debt minus cash and cash equivalents.

- Financial debt (non‑current + current) at the end of 2022 (2023‑01‑01):  
  Other Non‑current Financial Liabilities = €5,867 million  
  Other Current Financial Liabilities = €1,022 million  
  **Total debt** = 5,867 + 1,022 = €6,889 million  

- Cash and cash equivalents at the end of 2022 (2023‑01‑01): €2,584 million  

- **Net Debt** = 6,889 – 2,584 = €4,305 million  

**3. Ratio**  
\[
\text{Net Debt/EBITDA} = \frac{4,305}{1,505} \approx 2.86
\]

Thus, the Net Debt/EBITDA ratio for 2022, following the S&P methodology, is approximately **2.86**.

<answer>2.86</answer>