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Asset Quality - Aging Analysis of Past Due and Current Loans (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 112,606 | $ 119,394
Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 574 | 387
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 111,703 | 118,767
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 156 | 122
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 66 | 58
90 and Greater Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 107 | 60
Total Past Due and Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 903 | 627
Total commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 77,591 | 82,465
Accrued interest | 383 |
Total commercial loans | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 397 | 196
Total commercial loans | Commercial and Industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 55,815 | 59,647
Accrued interest | 522 | 417
Total commercial loans | Commercial and Industrial | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 297 | 174
Total commercial loans | Commercial mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 15,187 | 16,352
Total commercial loans | Commercial mortgage | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 100 | 21
Total commercial loans | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,066 | 2,530
Total commercial loans | Construction | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 0 | 0
Total commercial loans | Total commercial real estate loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 18,253 | 18,882
Total commercial loans | Total commercial real estate loans | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 100 | 21
Total commercial loans | Commercial lease financing |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,523 | 3,936
Total commercial loans | Commercial lease financing | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 0 | 1
Total commercial loans | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 207 | 172
Total commercial loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 76,988 | 82,129
Total commercial loans | Current | Commercial and Industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 55,354 | 59,366
Total commercial loans | Current | Commercial mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 15,049 | 16,305
Total commercial loans | Current | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,065 | 2,530
Total commercial loans | Current | Total commercial real estate loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 18,114 | 18,835
Total commercial loans | Current | Commercial lease financing |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,520 | 3,928
Total commercial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 90 | 62
Total commercial loans | 30-59 Days Past Due | Commercial and Industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 62 | 43
Total commercial loans | 30-59 Days Past Due | Commercial mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 25 | 16
Total commercial loans | 30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1 | 0
Total commercial loans | 30-59 Days Past Due | Total commercial real estate loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 26 | 16
Total commercial loans | 30-59 Days Past Due | Commercial lease financing |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 2 | 3
Total commercial loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 34 | 36
Total commercial loans | 60-89 Days Past Due | Commercial and Industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 30 | 33
Total commercial loans | 60-89 Days Past Due | Commercial mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3 | 2
Total commercial loans | 60-89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 0 | 0
Total commercial loans | 60-89 Days Past Due | Total commercial real estate loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3 | 2
Total commercial loans | 60-89 Days Past Due | Commercial lease financing |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1 | 1
Total commercial loans | 90 and Greater Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 82 | 42
Total commercial loans | 90 and Greater Days Past Due | Commercial and Industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 72 | 31
Total commercial loans | 90 and Greater Days Past Due | Commercial mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 10 | 8
Total commercial loans | 90 and Greater Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 0 | 0
Total commercial loans | 90 and Greater Days Past Due | Total commercial real estate loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 10 | 8
Total commercial loans | 90 and Greater Days Past Due | Commercial lease financing |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 0 | 3
Total commercial loans | Total Past Due and Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 603 | 336
Total commercial loans | Total Past Due and Non-performing Loans | Commercial and Industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 461 | 281
Total commercial loans | Total Past Due and Non-performing Loans | Commercial mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 138 | 47
Total commercial loans | Total Past Due and Non-performing Loans | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1 | 0
Total commercial loans | Total Past Due and Non-performing Loans | Total commercial real estate loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 139 | 47
Total commercial loans | Total Past Due and Non-performing Loans | Commercial lease financing |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3 | 8
Total consumer loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 35,015 | 36,929
Accrued interest | 139 |
Total consumer loans | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 177 | 191
Total consumer loans | Real estate — residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 20,958 | 21,401
Total consumer loans | Real estate — residential mortgage | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 71 | 77
Total consumer loans | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 7,139 | 7,951
Total consumer loans | Home equity loans | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 97 | 107
Total consumer loans | Consumer direct loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5,890 | 6,508
Total consumer loans | Consumer direct loans | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3 | 3
Total consumer loans | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,002 | 1,026
Total consumer loans | Credit cards | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5 | 3
Total consumer loans | Consumer indirect loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 26 | 43
Total consumer loans | Consumer indirect loans | Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1 | 1
Total consumer loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 34,715 | 36,638
Total consumer loans | Current | Real estate — residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 20,863 | 21,307
Total consumer loans | Current | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 7,001 | 7,804
Total consumer loans | Current | Consumer direct loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5,853 | 6,478
Total consumer loans | Current | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 974 | 1,007
Total consumer loans | Current | Consumer indirect loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 24 | 42
Total consumer loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 66 | 60
Total consumer loans | 30-59 Days Past Due | Real estate — residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 17 | 13
Total consumer loans | 30-59 Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 27 | 27
Total consumer loans | 30-59 Days Past Due | Consumer direct loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 15 | 15
Total consumer loans | 30-59 Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 6 | 5
Total consumer loans | 30-59 Days Past Due | Consumer indirect loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1 | 0
Total consumer loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 32 | 22
Total consumer loans | 60-89 Days Past Due | Real estate — residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 7 | 3
Total consumer loans | 60-89 Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 10 | 8
Total consumer loans | 60-89 Days Past Due | Consumer direct loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 10 | 7
Total consumer loans | 60-89 Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 5 | 4
Total consumer loans | 60-89 Days Past Due | Consumer indirect loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 0 | 0
Total consumer loans | 90 and Greater Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 25 | 18
Total consumer loans | 90 and Greater Days Past Due | Real estate — residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 0 | 1
Total consumer loans | 90 and Greater Days Past Due | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 4 | 5
Total consumer loans | 90 and Greater Days Past Due | Consumer direct loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 9 | 5
Total consumer loans | 90 and Greater Days Past Due | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 12 | 7
Total consumer loans | 90 and Greater Days Past Due | Consumer indirect loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 0 | 0
Total consumer loans | Total Past Due and Non-performing Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 300 | 291
Total consumer loans | Total Past Due and Non-performing Loans | Real estate — residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 95 | 94
Total consumer loans | Total Past Due and Non-performing Loans | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 138 | 147
Total consumer loans | Total Past Due and Non-performing Loans | Consumer direct loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 37 | 30
Total consumer loans | Total Past Due and Non-performing Loans | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 28 | 19
Total consumer loans | Total Past Due and Non-performing Loans | Consumer indirect loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 2 | $ 1

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