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Fair Value Measurements - Carrying Amounts and Estimated Fair Values for Certain Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financial assets:    
Other short-term investments [1] $ 17,215 $ 17,120
Held-to-maturity securities 11,498 11,278
Loans held for sale 576 640
Portfolio loans and leases 120,865 117,439
Financial liabilities:    
Deposits 166,569 167,252
Federal funds purchased 183 204
Other short-term borrowings 5,077 4,450
Long-term debt [1] 13,677 14,337
Net Carrying Amount    
Financial assets:    
Cash and due from banks 2,901 3,014
Other short-term investments 17,215 17,120
Other securities 868 778
Held-to-maturity securities 11,498 11,278
Loans held for sale 11 66
Portfolio loans and leases 120,758 117,331
Financial liabilities:    
Deposits 166,569 167,252
Federal funds purchased 183 204
Other short-term borrowings 5,077 4,450
Long-term debt 13,660 14,440
Net Carrying Amount | Commercial    
Financial assets:    
Portfolio loans and leases 73,241 72,139
Net Carrying Amount | Consumer    
Financial assets:    
Portfolio loans and leases 47,517 45,192
Total Fair Value    
Financial assets:    
Cash and due from banks 2,901 3,014
Other short-term investments 17,215 17,120
Other securities 868 778
Held-to-maturity securities 11,506 10,965
Loans held for sale 11 66
Portfolio loans and leases 121,467 114,474
Financial liabilities:    
Deposits 166,682 167,353
Federal funds purchased 183 204
Other short-term borrowings 5,079 4,459
Long-term debt 14,092 14,588
Total Fair Value | Commercial    
Financial assets:    
Portfolio loans and leases 74,325 72,319
Total Fair Value | Consumer    
Financial assets:    
Portfolio loans and leases 47,142 42,155
Total Fair Value | Level 1    
Financial assets:    
Cash and due from banks 2,901 3,014
Other short-term investments 17,215 17,120
Other securities 0 0
Held-to-maturity securities 2,436 2,344
Loans held for sale 0 0
Portfolio loans and leases 0 0
Financial liabilities:    
Deposits 0 0
Federal funds purchased 183 204
Other short-term borrowings 0 0
Long-term debt 8,502 3,753
Total Fair Value | Level 1 | Commercial    
Financial assets:    
Portfolio loans and leases 0 0
Total Fair Value | Level 1 | Consumer    
Financial assets:    
Portfolio loans and leases 0 0
Total Fair Value | Level 2    
Financial assets:    
Cash and due from banks 0 0
Other short-term investments 0 0
Other securities 868 778
Held-to-maturity securities 9,068 8,619
Loans held for sale 0 0
Portfolio loans and leases 0 0
Financial liabilities:    
Deposits 166,682 167,353
Federal funds purchased 0 0
Other short-term borrowings 5,079 4,459
Long-term debt 5,590 10,835
Total Fair Value | Level 2 | Commercial    
Financial assets:    
Portfolio loans and leases 0 0
Total Fair Value | Level 2 | Consumer    
Financial assets:    
Portfolio loans and leases 0 0
Total Fair Value | Level 3    
Financial assets:    
Cash and due from banks 0 0
Other short-term investments 0 0
Other securities 0 0
Held-to-maturity securities 2 2
Loans held for sale 11 66
Portfolio loans and leases 121,467 114,474
Financial liabilities:    
Deposits 0 0
Federal funds purchased 0 0
Other short-term borrowings 0 0
Long-term debt 0 0
Total Fair Value | Level 3 | Commercial    
Financial assets:    
Portfolio loans and leases 74,325 72,319
Total Fair Value | Level 3 | Consumer    
Financial assets:    
Portfolio loans and leases $ 47,142 $ 42,155
[1] Includes $42 and $51 of other short-term investments, $649 and $1,000 of portfolio loans and leases, $(11) and $(19) of ALLL, $4 and $5 of other assets, $11 and $12 of other liabilities and $563 and $889 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2025 and December 31, 2024, respectively. For further information, refer to Note 7.