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Fair Values of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Financial Assets    
Cash and due from banks $ 41,652 $ 28,905
Investment securities held-to-maturity 85,574 [1] 41,858
Loans 336,691 306,304
Financial Liabilities    
Long-term debt 32,228 32,125
Carrying Amount [Member]    
Financial Assets    
Cash and due from banks 41,652 28,905
Federal funds sold and securities purchased under resale agreements 440 359
Investment securities held-to-maturity 85,574 41,858
Loans held for sale 164 1,152
Loans 336,691 306,304
Other 2,199 1,521
Financial Liabilities    
Time deposits 42,459 22,665
Short-term borrowings 23,160 9,750
Long-term debt 32,228 32,125
Other 4,219 3,862
Fair Value [Member]    
Financial Assets    
Cash and due from banks 41,652 28,905
Federal funds sold and securities purchased under resale agreements 440 359
Investment securities held-to-maturity 74,128 41,812
Loans held for sale 164 1,152
Loans 326,896 312,724
Other 2,199 1,521
Financial Liabilities    
Time deposits 41,643 22,644
Short-term borrowings 22,662 9,646
Long-term debt 30,624 32,547
Other 4,219 3,862
Fair Value [Member] | Level 1 [Member]    
Financial Assets    
Cash and due from banks 41,652 28,905
Investment securities held-to-maturity 1,288  
Fair Value [Member] | Level 2 [Member]    
Financial Assets    
Federal funds sold and securities purchased under resale agreements 440 359
Investment securities held-to-maturity 72,840 41,812
Other 1,491 630
Financial Liabilities    
Time deposits 41,643 22,644
Short-term borrowings 22,662 9,646
Long-term debt 30,624 32,547
Other 1,132 1,170
Fair Value [Member] | Level 3 [Member]    
Financial Assets    
Loans held for sale 164 1,152
Loans 326,896 312,724
Other 708 891
Financial Liabilities    
Other $ 3,087 $ 2,692
[1] The weighted-average maturity of total held-to-maturity investment securities was 7.4 years at December 31, 2021, with a corresponding weighted-average yield of 1.45 percent. The weighted-average maturity of total available-for-sale investment securities was 5.5 years at December 31, 2021, with a corresponding weighted-average yield of 1.73 percent.