Maturity Analysis of the Earliest Contractual Undiscounted Cash Flows of Financial Liabilities (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Maturity Analysis of Financial Liabilities (IFRS) [Line Items] | ||||||||||||||||||||
| Lease liabilities | € 4,200 | € 4,500 | ||||||||||||||||||
| On demand | ||||||||||||||||||||
| Maturity Analysis of Financial Liabilities (IFRS) [Line Items] | ||||||||||||||||||||
| Noninterest bearing deposits | 174,274 | 177,915 | ||||||||||||||||||
| Interest-bearing deposits | 245,203 | 198,045 | ||||||||||||||||||
| Trading liabilities | 42,879 | [1] | 43,498 | [2] | ||||||||||||||||
| Negative market values from derivative financial instruments | 225,827 | [1] | 276,410 | [2] | ||||||||||||||||
| Financial liabilities designated at fair value through profit or loss | 30,752 | 30,224 | ||||||||||||||||||
| Investment contract liabilities | 0 | [3] | 0 | [4] | ||||||||||||||||
| Negative market values from derivative financial instruments qualifying for hedge accounting | 0 | [5] | 0 | [6] | ||||||||||||||||
| Central bank funds purchased | 1,967 | 1,227 | ||||||||||||||||||
| Securities sold under repurchase agreements | 470 | 407 | ||||||||||||||||||
| Securities loaned | 2 | 2 | ||||||||||||||||||
| Other short-term borrowings | 6,416 | 1,487 | ||||||||||||||||||
| Long-term debt | 1 | 0 | ||||||||||||||||||
| Trust preferred securities | 0 | 0 | ||||||||||||||||||
| Lease liabilities | 122 | 3 | ||||||||||||||||||
| Other financial liabilities | 116,713 | 72,780 | ||||||||||||||||||
| Off-balance sheet loan commitments | 211,367 | 212,990 | ||||||||||||||||||
| Financial guarantees | 35,949 | 32,368 | ||||||||||||||||||
| Total | 1,091,941 | [7] | 1,047,356 | [8] | ||||||||||||||||
| Not later than three months | ||||||||||||||||||||
| Maturity Analysis of Financial Liabilities (IFRS) [Line Items] | ||||||||||||||||||||
| Noninterest bearing deposits | 0 | 0 | ||||||||||||||||||
| Interest-bearing deposits | 148,888 | 159,292 | ||||||||||||||||||
| Trading liabilities | 0 | [1] | 0 | [2] | ||||||||||||||||
| Negative market values from derivative financial instruments | 0 | [1] | 0 | [2] | ||||||||||||||||
| Financial liabilities designated at fair value through profit or loss | 45,626 | 35,024 | ||||||||||||||||||
| Investment contract liabilities | 0 | [3] | 0 | [4] | ||||||||||||||||
| Negative market values from derivative financial instruments qualifying for hedge accounting | 72 | [5] | 978 | [6] | ||||||||||||||||
| Central bank funds purchased | 0 | 0 | ||||||||||||||||||
| Securities sold under repurchase agreements | 767 | 1,143 | ||||||||||||||||||
| Securities loaned | 0 | 0 | ||||||||||||||||||
| Other short-term borrowings | 3,882 | 5,767 | ||||||||||||||||||
| Long-term debt | 12,456 | 7,119 | ||||||||||||||||||
| Trust preferred securities | 0 | 0 | ||||||||||||||||||
| Lease liabilities | 147 | 157 | ||||||||||||||||||
| Other financial liabilities | 3,554 | 1,076 | ||||||||||||||||||
| Off-balance sheet loan commitments | 0 | 0 | ||||||||||||||||||
| Financial guarantees | 0 | 0 | ||||||||||||||||||
| Total | 215,391 | [7] | 210,557 | [8] | ||||||||||||||||
| Later than three months and not later than one year | ||||||||||||||||||||
| Maturity Analysis of Financial Liabilities (IFRS) [Line Items] | ||||||||||||||||||||
| Noninterest bearing deposits | 0 | 0 | ||||||||||||||||||
| Interest-bearing deposits | 117,503 | 112,543 | ||||||||||||||||||
| Trading liabilities | 0 | [1] | 0 | [2] | ||||||||||||||||
| Negative market values from derivative financial instruments | 0 | [1] | 0 | [2] | ||||||||||||||||
| Financial liabilities designated at fair value through profit or loss | 11,122 | 5,943 | ||||||||||||||||||
| Investment contract liabilities | 469 | [3] | 454 | [4] | ||||||||||||||||
| Negative market values from derivative financial instruments qualifying for hedge accounting | 24 | [5] | 614 | [6] | ||||||||||||||||
| Central bank funds purchased | 0 | 0 | ||||||||||||||||||
| Securities sold under repurchase agreements | 584 | 182 | ||||||||||||||||||
| Securities loaned | 0 | 0 | ||||||||||||||||||
| Other short-term borrowings | 8,197 | 2,862 | ||||||||||||||||||
| Long-term debt | 14,408 | 18,030 | ||||||||||||||||||
| Trust preferred securities | 299 | 302 | ||||||||||||||||||
| Lease liabilities | 430 | 454 | ||||||||||||||||||
| Other financial liabilities | 556 | 1,059 | ||||||||||||||||||
| Off-balance sheet loan commitments | 0 | 0 | ||||||||||||||||||
| Financial guarantees | 0 | 0 | ||||||||||||||||||
| Total | 153,593 | [7] | 142,443 | [8] | ||||||||||||||||
| Later than one year and not later than five years | ||||||||||||||||||||
| Maturity Analysis of Financial Liabilities (IFRS) [Line Items] | ||||||||||||||||||||
| Noninterest bearing deposits | 0 | 0 | ||||||||||||||||||
| Interest-bearing deposits | 14,882 | 16,012 | ||||||||||||||||||
| Trading liabilities | 0 | [1] | 0 | [2] | ||||||||||||||||
| Negative market values from derivative financial instruments | 0 | [1] | 0 | [2] | ||||||||||||||||
| Financial liabilities designated at fair value through profit or loss | 15,674 | 13,767 | ||||||||||||||||||
| Investment contract liabilities | 0 | [3] | 0 | [4] | ||||||||||||||||
| Negative market values from derivative financial instruments qualifying for hedge accounting | 33 | [5] | 27 | [6] | ||||||||||||||||
| Central bank funds purchased | 0 | 0 | ||||||||||||||||||
| Securities sold under repurchase agreements | 601 | 1,089 | ||||||||||||||||||
| Securities loaned | 0 | 0 | ||||||||||||||||||
| Other short-term borrowings | 0 | 0 | ||||||||||||||||||
| Long-term debt | 70,203 | 70,602 | ||||||||||||||||||
| Trust preferred securities | 0 | 0 | ||||||||||||||||||
| Lease liabilities | 1,814 | 1,933 | ||||||||||||||||||
| Other financial liabilities | 699 | 1,829 | ||||||||||||||||||
| Off-balance sheet loan commitments | 0 | 0 | ||||||||||||||||||
| Financial guarantees | 0 | 0 | ||||||||||||||||||
| Total | 103,905 | [7] | 105,258 | [8] | ||||||||||||||||
| Later than five years | ||||||||||||||||||||
| Maturity Analysis of Financial Liabilities (IFRS) [Line Items] | ||||||||||||||||||||
| Noninterest bearing deposits | 0 | 0 | ||||||||||||||||||
| Interest-bearing deposits | 11,777 | 10,422 | ||||||||||||||||||
| Trading liabilities | 0 | [1] | 0 | [2] | ||||||||||||||||
| Negative market values from derivative financial instruments | 0 | [1] | 0 | [2] | ||||||||||||||||
| Financial liabilities designated at fair value through profit or loss | 12,403 | 8,373 | ||||||||||||||||||
| Investment contract liabilities | 0 | [3] | 0 | [4] | ||||||||||||||||
| Negative market values from derivative financial instruments qualifying for hedge accounting | 43 | [5] | 57 | [6] | ||||||||||||||||
| Central bank funds purchased | 0 | 0 | ||||||||||||||||||
| Securities sold under repurchase agreements | 109 | 25 | ||||||||||||||||||
| Securities loaned | 0 | 0 | ||||||||||||||||||
| Other short-term borrowings | 0 | 0 | ||||||||||||||||||
| Long-term debt | 33,230 | 36,195 | ||||||||||||||||||
| Trust preferred securities | 0 | 0 | ||||||||||||||||||
| Lease liabilities | 2,632 | 3,116 | ||||||||||||||||||
| Other financial liabilities | 46 | 87 | ||||||||||||||||||
| Off-balance sheet loan commitments | 0 | 0 | ||||||||||||||||||
| Financial guarantees | 0 | 0 | ||||||||||||||||||
| Total | € 60,240 | [7] | € 58,275 | [8] | ||||||||||||||||
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