To estimate the S&P credit trend for ENGIE from 2021 to 2022, we follow the prescribed workflow:

### Step 1: Identify Industry
ENGIE is a global energy and services group primarily engaged in electricity generation, distribution, and supply. It fits the **Unregulated Power and Gas** industry.

### Step 2-6: Calculate 2021 Financials
*   **EBITDA (2021):** Current Operating Income (6,116) + Depreciation/Amortization/Provisions (4,840) = 10,956M EUR.
*   **Adjusted_EBITDA (2021):** 10,956M EUR.
*   **FFO (2021):** Adjusted_EBITDA (10,956) - Cash Interest (2,061) - Cash Taxes (603) = 8,292M EUR.
*   **Adjusted_Debt (2021):** Long-term Borrowings (30,458) + Current Borrowings (10,590) - Cash (13,890) = 27,158M EUR.
*   **Debt/EBITDA (2021):** 27,158 / 10,956 = **2.48x**.
*   **FFO/Debt (2021):** 8,292 / 27,158 = **0.305**.

### Step 7-11: Calculate 2022 Financials
*   **EBITDA (2022):** Current Operating Income (4,309) + Depreciation/Amortization/Provisions (5,187) = 9,496M EUR.
*   **Adjusted_EBITDA (2022):** 9,496M EUR.
*   **FFO (2022):** Adjusted_EBITDA (9,496) - Cash Interest (3,700) - Cash Taxes (1,504) = 4,292M EUR.
*   **Adjusted_Debt (2022):** Long-term Borrowings (28,083) + Current Borrowings (12,508) - Cash (15,570) = 25,021M EUR.
*   **Debt/EBITDA (2022):** 25,021 / 9,496 = **2.64x**.
*   **FFO/Debt (2022):** 4,292 / 25,021 = **0.172**.

### Step 12: Determine Credit Trend
*   **Signal 1 (Leverage):** 2.64x - 2.48x = **+0.16x**. (Threshold: ±0.2x). **Result: Stable**.
*   **Signal 2 (Coverage):** 0.172 - 0.305 = **-0.133**. (Threshold: ±0.03). **Result: Deteriorating**.

**Reasoning:** The Leverage ratio remained relatively stable (within the +0.2x margin). However, the Cash-flow coverage ratio experienced a significant decline (down 13.3 percentage points, well beyond the -0.03 threshold). The sharp increase in interest and tax expenses in 2022 significantly eroded the company's ability to cover its debt with operating cash flows. Following the conservative bias instructions, the deterioration in cash-flow coverage is the more material signal for credit quality.

<answer>Deteriorating</answer>