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Fair Value (Schedule of Carrying Values and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity investment securities $ 10,466 $ 11,239
Time deposits 9,996 2,309
Long-term debt 542 651
Level 2 | Fair value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity investment securities 10,466 11,239
Time deposits 9,964 2,269
Long-term debt 494 635
Level 2 | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity investment securities 10,382 11,126
Time deposits 9,996 2,309
Long-term debt 542 651
Level 3 | Fair value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans and leases (including loans held for sale), net of allowance 54,832 53,093
Level 3 | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans and leases (including loans held for sale), net of allowance $ 57,148 $ 55,086