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Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
HTM investment securities $ 596 $ 597
Time deposits 3,451 4,719
Long-term debt 1,347 1,723
Level 2 | Carrying value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
HTM investment securities 592 592
Time deposits 3,451 4,719
Long-term debt 1,347 1,723
Level 2 | Estimated fair value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
HTM investment securities 596 597
Time deposits 3,471 4,725
Long-term debt 1,332 1,751
Level 3 | Carrying value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases (including loans held for sale), net of allowance 53,981 48,343
Level 3 | Estimated fair value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases (including loans held for sale), net of allowance $ 54,154 $ 47,958