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Fair Value (Schedule of Carrying Values and Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity investment securities $ 640 $ 597
Time deposits 2,588 4,719
Long-term debt 1,336 1,723
Level 2 | Carrying value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity investment securities 636 592
Time deposits 2,588 4,719
Long-term debt 1,336 1,723
Level 2 | Estimated fair value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity investment securities 640 597
Time deposits 2,603 4,725
Long-term debt 1,346 1,751
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 52,780 48,343
Level 3 | Estimated fair value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans and leases (including loans held for sale), net of allowance $ 53,221 $ 47,958