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Credit Quality And Allowance For Credit Losses (Changes In The Allowance For Loan Losses And Related Loan Amounts) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2022 | Jan. 01, 2021 | Jan. 01, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Balance at beginning of period | $ 618 | $ 992 | $ 668 |  |  |
Provision for loan losses | 60 | (384) | 537 |  |  |
Balance at end of period | $ 661 | $ 618 | $ 992 |  |  |
Allowance as a percentage of total loans | 1.24% | 1.26% | 1.90% |  |  |
Cumulative effect of change in accounting principle |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Reduction in business loans allowance for credit losses |  |  |  | $ 0 | $ 0 | $ (42)
Increase in retail loans allowance for credit losses |  |  |  | 0 | 0 | 25
Day-one decrease in the overall allowance for credit losses |  |  |  | $ 0 | $ 0 | $ (17)
Financing Receivable |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Balance at beginning of period | $ 588 | $ 948 | $ 637 |  |  |
Loan charge-offs | (68) | (70) | (238) |  |  |
Recoveries on loans previously charged-off | 51 | 80 | 42 |  |  |
Net loan (charge-offs) recoveries | (17) | 10 | (196) |  |  |
Provision for loan losses | 39 | (370) | 524 |  |  |
Balance at end of period | $ 610 | $ 588 | $ 948 |  |  |
Allowance as a percentage of total loans | 1.14% | 1.19% | 1.81% |  |  |
Unused Commitments to Extend Credit |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Balance at beginning of period | $ 30 | $ 44 | $ 31 |  |  |
Provision for loan losses | 21 | (14) | 13 |  |  |
Balance at end of period | 51 | 30 | 44 |  |  |
Business loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Balance at beginning of period | 555 | 930 | 629 |  |  |
Provision for loan losses | 44 | (384) | 538 |  |  |
Balance at end of period | $ 581 | $ 555 | $ 930 |  |  |
Allowance as a percentage of total loans | 1.18% | 1.22% | 1.93% |  |  |
Business loans | Financing Receivable |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Balance at beginning of period | $ 531 | $ 895 | $ 601 |  |  |
Loan charge-offs | (65) | (67) | (233) |  |  |
Recoveries on loans previously charged-off | 47 | 76 | 38 |  |  |
Net loan (charge-offs) recoveries | (18) | 9 | (195) |  |  |
Provision for loan losses | 28 | (373) | 531 |  |  |
Balance at end of period | $ 541 | $ 531 | $ 895 |  |  |
Allowance as a percentage of total loans | 1.10% | 1.17% | 1.85% |  |  |
Business loans | Unused Commitments to Extend Credit |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Balance at beginning of period | $ 24 | $ 35 | $ 28 |  |  |
Provision for loan losses | 16 | (11) | 7 |  |  |
Balance at end of period | 40 | 24 | 35 |  |  |
Retail loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Balance at beginning of period | 63 | 62 | 39 |  |  |
Provision for loan losses | 16 | 0 | (1) |  |  |
Balance at end of period | $ 80 | $ 63 | $ 62 |  |  |
Allowance as a percentage of total loans | 1.96% | 1.63% | 1.55% |  |  |
Retail loans | Financing Receivable |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Balance at beginning of period | $ 57 | $ 53 | $ 36 |  |  |
Loan charge-offs | (3) | (3) | (5) |  |  |
Recoveries on loans previously charged-off | 4 | 4 | 4 |  |  |
Net loan (charge-offs) recoveries | 1 | 1 | (1) |  |  |
Provision for loan losses | 11 | 3 | (7) |  |  |
Balance at end of period | $ 69 | $ 57 | $ 53 |  |  |
Allowance as a percentage of total loans | 1.67% | 1.47% | 1.32% |  |  |
Retail loans | Unused Commitments to Extend Credit |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Balance at beginning of period | $ 6 | $ 9 | $ 3 |  |  |
Provision for loan losses | 5 | (3) | 6 |  |  |
Balance at end of period | $ 11 | $ 6 | $ 9 |  |  |

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