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Fair value measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Cash and cash equivalents    
Interest-bearing deposits at banks $ 16,751 $ 18,873
Investment securities held to maturity 36,864 34,051
Net loans 134,813 133,397
Financial liabilities:    
Short-term borrowings 59 60
Loan facility carrying amount [1] 12,928 12,605
Level 1    
Cash and cash equivalents    
Cash and cash equivalents 1,811 1,749
Interest-bearing deposits at banks 0 0
Investment securities held to maturity 0 0
Net loans 0 0
Financial liabilities:    
Time deposits 0 0
Short-term borrowings 0 0
Loan facility carrying amount 0 0
Level 2    
Cash and cash equivalents    
Cash and cash equivalents 139 160
Interest-bearing deposits at banks 16,751 18,873
Investment securities held to maturity 11,879 12,909
Net loans 7,113 6,806
Financial liabilities:    
Time deposits 13,591 14,463
Short-term borrowings 2,059 1,060
Loan facility carrying amount 13,163 12,754
Level 3    
Cash and cash equivalents    
Cash and cash equivalents 0 0
Interest-bearing deposits at banks 0 0
Investment securities held to maturity 45 46
Net loans 127,482 124,528
Financial liabilities:    
Time deposits 0 0
Short-term borrowings 0 0
Loan facility carrying amount 0 0
Carrying Amount    
Cash and cash equivalents    
Cash and cash equivalents 1,950 1,909
Interest-bearing deposits at banks 16,751 18,873
Investment securities held to maturity 12,711 14,195
Net loans 134,813 133,397
Financial liabilities:    
Time deposits 13,620 14,476
Short-term borrowings 2,059 1,060
Loan facility carrying amount 12,928 12,605
Estimated Fair Value    
Cash and cash equivalents    
Cash and cash equivalents 1,950 1,909
Interest-bearing deposits at banks 16,751 18,873
Investment securities held to maturity 11,924 12,955
Net loans 134,595 131,334
Financial liabilities:    
Time deposits 13,591 14,463
Short-term borrowings 2,059 1,060
Loan facility carrying amount $ 13,163 $ 12,754
[1] Loans of $2.3 billion and $1.5 billion at September 30, 2025 and December 31, 2024, respectively, were held in special purpose trusts to settle the respective obligations of asset-backed notes issued by those trusts. The outstanding balances of those asset-backed notes issued to third party investors were included in Long-term borrowings and were $1.9 billion at September 30, 2025 and $1.2 billion at December 31, 2024.