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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
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | $ 661 | $ 618 | $ 992
Provision for loan losses | 89 | 60 | (384)
Balance at end of period | $ 728 | $ 661 | $ 618
As a percentage of total loans | 1.40% | 1.24% | 1.26%
Total allowance for loan losses | $ 728 | $ 661 | $ 618
Financing Receivable [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | 610 | 588 | 948
Loan charge-offs | (62) | (68) | (70)
Recoveries on loans previously charged-off | 40 | 51 | 80
Net loan (charge-offs) recoveries | (22) | (17) | 10
Provision for loan losses | 100 | 39 | (370)
Balance at end of period | $ 688 | $ 610 | $ 588
As a percentage of total loans | 1.32% | 1.14% | 1.19%
Total allowance for loan losses | $ 688 | $ 610 | $ 588
Unused Commitments to Extend Credit |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | 51 | 30 | 44
Provision for loan losses | (11) | 21 | (14)
Balance at end of period | 40 | 51 | 30
Total allowance for loan losses | 40 | 51 | 30
Business loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | 581 | 555 | 930
Provision for loan losses | 91 | 44 | (384)
Balance at end of period | $ 651 | $ 581 | $ 555
As a percentage of total loans | 1.36% | 1.18% | 1.22%
Total allowance for loan losses | $ 651 | $ 581 | $ 555
Business loans | Financing Receivable [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | 541 | 531 | 895
Loan charge-offs | (59) | (65) | (67)
Recoveries on loans previously charged-off | 38 | 47 | 76
Net loan (charge-offs) recoveries | (21) | (18) | 9
Provision for loan losses | 100 | 28 | (373)
Balance at end of period | $ 620 | $ 541 | $ 531
As a percentage of total loans | 1.29% | 1.10% | 1.17%
Total allowance for loan losses | $ 620 | $ 541 | $ 531
Business loans | Unused Commitments to Extend Credit |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | 40 | 24 | 35
Provision for loan losses | (9) | 16 | (11)
Balance at end of period | 31 | 40 | 24
Total allowance for loan losses | 31 | 40 | 24
Retail loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | 80 | 63 | 62
Provision for loan losses | (2) | 16 | 0
Balance at end of period | $ 77 | $ 80 | $ 63
As a percentage of total loans | 1.85% | 1.96% | 1.63%
Total allowance for loan losses | $ 77 | $ 80 | $ 63
Retail loans | Financing Receivable [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | 69 | 57 | 53
Loan charge-offs | (3) | (3) | (3)
Recoveries on loans previously charged-off | 2 | 4 | 4
Net loan (charge-offs) recoveries | (1) | 1 | 1
Provision for loan losses | 0 | 11 | 3
Balance at end of period | $ 68 | $ 69 | $ 57
As a percentage of total loans | 1.63% | 1.67% | 1.47%
Total allowance for loan losses | $ 68 | $ 69 | $ 57
Retail loans | Unused Commitments to Extend Credit |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Balance at beginning of period | 11 | 6 | 9
Provision for loan losses | (2) | 5 | (3)
Balance at end of period | 9 | 11 | 6
Total allowance for loan losses | $ 9 | $ 11 | $ 6

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