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Allowance For Credit Losses (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Nonaccrual, No Allowance   $ 151 $ 127
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Nonaccrual, No Allowance   $ 151  
Consumer Unsecured Loans sold in period      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables, book balance sold in period $ 1,200    
Allowance for loan losses, related to loans sold prior to sale 94    
Financing Receiable, Allowance for Credit loss, writeoff on loans sold 63    
Allowance for Loan and Lease Losses, Loans Sold $ 31    
Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing period for consumer loans, in years   15 years  
Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing period for consumer loans, in years   30 years