Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Loans And Leases [Line Items] | ||
| Total Loans, New TDRs | $ 239 | $ 374 |
| Minimum [Member] | ||
| Loans And Leases [Line Items] | ||
| Financing period for consumer loans, in years | 15 years | |
| Maximum [Member] | ||
| Loans And Leases [Line Items] | ||
| Financing period for consumer loans, in years | 30 years | |