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Fair Value (Schedule Of Carrying Values And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity, fair value $ 767  
Loans and Leases Receivable, Net Amount 46,219 $ 44,262
Time deposits 4,336  
Long-term debt (less fair value hedges) 724 383
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Securities, Held-to-maturity 774 770
Time deposits 4,336 3,115
Long-term debt (less fair value hedges) 724 383
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Held-to-maturity, fair value 767 762
Time deposits 4,319 3,099
Long-term debt (less fair value hedges) 727 402
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans and Leases Receivable, Net Amount 46,312 44,306
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans and Leases Receivable, Net Amount $ 45,251 $ 44,226