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Loans and Related Allowance for Credit Losses (Home Equity and Residential Real Estate Credit Quality Indicators) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Total loans, net | [1] | $ 321,381 |  | $ 321,381 |  | $ 321,508
Gross charge-offs |  |  |  |  |  |
Total |  | 376 | $ 233 | 1,081 | $ 808 |
Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 2,195 |  | 2,195 |  | 5,335
Year two |  | 4,838 |  | 4,838 |  | 10,064
Year three |  | 9,649 |  | 9,649 |  | 15,484
Year four |  | 14,854 |  | 14,854 |  | 6,832
Year five |  | 6,472 |  | 6,472 |  | 2,270
Prior |  | 8,964 |  | 8,964 |  | 7,559
Total loans, net |  | 46,972 |  | 46,972 |  | 47,544
Gross charge-offs |  |  |  |  |  |
Year two |  |  |  |  |  | 2
Year three |  |  |  |  |  | 1
Year four |  |  |  |  |  | 1
Prior |  |  |  | 2 |  | 4
Total |  |  |  | 2 |  | 8
Home equity |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year two |  |  |  |  |  |
Year three |  |  |  |  |  | 162
Year four |  | 151 |  | 151 |  | 1,918
Year five |  | 1,764 |  | 1,764 |  | 868
Prior |  | 3,003 |  | 3,003 |  | 2,592
Revolving Loans |  | 8,297 |  | 8,297 |  | 8,265
Revolving Loans Converted to Term |  | 12,755 |  | 12,755 |  | 12,345
Total loans, net |  | 25,970 |  | 25,970 |  | 26,150
Gross charge-offs |  |  |  |  |  |
Prior |  |  |  | 1 |  | 4
Revolving Loans |  |  |  | 13 |  | 7
Revolving Loans Converted to Term |  |  |  | 13 |  | 10
Total |  |  |  | 27 |  | 21
Greater than or equal to 780 | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 1,302 |  | 1,302 |  | 3,206
Year two |  | 3,337 |  | 3,337 |  | 7,797
Year three |  | 7,639 |  | 7,639 |  | 12,197
Year four |  | 11,832 |  | 11,832 |  | 5,035
Year five |  | 4,726 |  | 4,726 |  | 1,492
Prior |  | 5,042 |  | 5,042 |  | 4,004
Total loans, net |  | 33,878 |  | 33,878 |  | 33,731
Greater than or equal to 780 | Home equity |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year two |  |  |  |  |  |
Year three |  |  |  |  |  | 102
Year four |  | 96 |  | 96 |  | 1,254
Year five |  | 1,177 |  | 1,177 |  | 489
Prior |  | 1,845 |  | 1,845 |  | 1,605
Revolving Loans |  | 4,626 |  | 4,626 |  | 4,604
Revolving Loans Converted to Term |  | 6,203 |  | 6,203 |  | 6,083
Total loans, net |  | 13,947 |  | 13,947 |  | 14,137
720 to 779 | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 775 |  | 775 |  | 1,482
Year two |  | 960 |  | 960 |  | 1,659
Year three |  | 1,484 |  | 1,484 |  | 2,389
Year four |  | 2,152 |  | 2,152 |  | 1,107
Year five |  | 1,081 |  | 1,081 |  | 432
Prior |  | 1,609 |  | 1,609 |  | 1,388
Total loans, net |  | 8,061 |  | 8,061 |  | 8,457
720 to 779 | Home equity |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year two |  |  |  |  |  |
Year three |  |  |  |  |  | 38
Year four |  | 37 |  | 37 |  | 423
Year five |  | 368 |  | 368 |  | 216
Prior |  | 606 |  | 606 |  | 488
Revolving Loans |  | 2,225 |  | 2,225 |  | 2,222
Revolving Loans Converted to Term |  | 3,265 |  | 3,265 |  | 3,225
Total loans, net |  | 6,501 |  | 6,501 |  | 6,612
660 to 719 | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 114 |  | 114 |  | 400
Year two |  | 273 |  | 273 |  | 508
Year three |  | 411 |  | 411 |  | 657
Year four |  | 618 |  | 618 |  | 334
Year five |  | 342 |  | 342 |  | 171
Prior |  | 816 |  | 816 |  | 721
Total loans, net |  | 2,574 |  | 2,574 |  | 2,791
660 to 719 | Home equity |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year two |  |  |  |  |  |
Year three |  |  |  |  |  | 17
Year four |  | 15 |  | 15 |  | 174
Year five |  | 157 |  | 157 |  | 110
Prior |  | 302 |  | 302 |  | 271
Revolving Loans |  | 1,198 |  | 1,198 |  | 1,207
Revolving Loans Converted to Term |  | 2,039 |  | 2,039 |  | 1,894
Total loans, net |  | 3,711 |  | 3,711 |  | 3,673
Less than 660 | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 3 |  | 3 |  | 93
Year two |  | 116 |  | 116 |  | 71
Year three |  | 85 |  | 85 |  | 133
Year four |  | 148 |  | 148 |  | 122
Year five |  | 102 |  | 102 |  | 82
Prior |  | 703 |  | 703 |  | 680
Total loans, net |  | 1,157 |  | 1,157 |  | 1,181
Less than 660 | Home equity |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year two |  |  |  |  |  |
Year three |  |  |  |  |  | 5
Year four |  | 3 |  | 3 |  | 65
Year five |  | 60 |  | 60 |  | 52
Prior |  | 243 |  | 243 |  | 220
Revolving Loans |  | 241 |  | 241 |  | 223
Revolving Loans Converted to Term |  | 1,202 |  | 1,202 |  | 1,089
Total loans, net |  | 1,749 |  | 1,749 |  | 1,654
No FICO score available | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 1 |  | 1 |  | 140
Year two |  | 135 |  | 135 |  | 9
Year three |  | 8 |  | 8 |  | 92
Year four |  | 88 |  | 88 |  | 168
Year five |  | 154 |  | 154 |  | 56
Prior |  | 292 |  | 292 |  | 266
Total loans, net |  | 678 |  | 678 |  | 731
No FICO score available | Home equity |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year three |  |  |  |  |  |
Year four |  |  |  |  |  | 2
Year five |  | 2 |  | 2 |  | 1
Prior |  | 7 |  | 7 |  | 8
Revolving Loans |  | 7 |  | 7 |  | 9
Revolving Loans Converted to Term |  | 46 |  | 46 |  | 54
Total loans, net |  | 62 |  | 62 |  | 74
Government insured or guaranteed loans | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  |  |  |  |  | 14
Year two |  | 17 |  | 17 |  | 20
Year three |  | 22 |  | 22 |  | 16
Year four |  | 16 |  | 16 |  | 66
Year five |  | 67 |  | 67 |  | 37
Prior |  | 502 |  | 502 |  | 500
Total loans, net |  | 624 |  | 624 |  | 653
Greater than 100% | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 5 |  | 5 |  | 15
Year two |  | 68 |  | 68 |  | 139
Year three |  | 113 |  | 113 |  | 79
Year four |  | 59 |  | 59 |  | 31
Year five |  | 23 |  | 23 |  | 10
Prior |  | 31 |  | 31 |  | 28
Total loans, net |  | 299 |  | 299 |  | 302
Greater than 100% | Home equity |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year two |  |  |  |  |  |
Year three |  |  |  |  |  | 1
Year four |  | 1 |  | 1 |  | 12
Year five |  | 12 |  | 12 |  | 6
Prior |  | 15 |  | 15 |  | 14
Revolving Loans |  | 333 |  | 333 |  | 306
Revolving Loans Converted to Term |  | 328 |  | 328 |  | 309
Total loans, net |  | 689 |  | 689 |  | 648
Greater than or equal to 80% to 100% | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 608 |  | 608 |  | 1,665
Year two |  | 633 |  | 633 |  | 1,928
Year three |  | 963 |  | 963 |  | 955
Year four |  | 581 |  | 581 |  | 221
Year five |  | 176 |  | 176 |  | 69
Prior |  | 134 |  | 134 |  | 92
Total loans, net |  | 3,095 |  | 3,095 |  | 4,930
Greater than or equal to 80% to 100% | Home equity |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year two |  |  |  |  |  |
Year three |  |  |  |  |  | 4
Year four |  | 5 |  | 5 |  | 40
Year five |  | 32 |  | 32 |  | 17
Prior |  | 30 |  | 30 |  | 22
Revolving Loans |  | 1,042 |  | 1,042 |  | 1,116
Revolving Loans Converted to Term |  | 1,552 |  | 1,552 |  | 1,743
Total loans, net |  | 2,661 |  | 2,661 |  | 2,942
Less than 80% | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 1,582 |  | 1,582 |  | 3,585
Year two |  | 4,084 |  | 4,084 |  | 7,977
Year three |  | 8,551 |  | 8,551 |  | 14,421
Year four |  | 14,187 |  | 14,187 |  | 6,514
Year five |  | 6,206 |  | 6,206 |  | 2,154
Prior |  | 8,294 |  | 8,294 |  | 6,935
Total loans, net |  | 42,904 |  | 42,904 |  | 41,586
Less than 80% | Home equity |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year two |  |  |  |  |  |
Year three |  |  |  |  |  | 157
Year four |  | 145 |  | 145 |  | 1,866
Year five |  | 1,720 |  | 1,720 |  | 845
Prior |  | 2,958 |  | 2,958 |  | 2,556
Revolving Loans |  | 6,922 |  | 6,922 |  | 6,843
Revolving Loans Converted to Term |  | 10,875 |  | 10,875 |  | 10,293
Total loans, net |  | 22,620 |  | 22,620 |  | 22,560
No LTV available | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  |  |  |  |  | 56
Year two |  | 36 |  | 36 |  |
Year three |  |  |  |  |  | 13
Year four |  | 11 |  | 11 |  |
Year five |  |  |  |  |  |
Prior |  | 3 |  | 3 |  | 4
Total loans, net |  | $ 50 |  | $ 50 |  | $ 73
[1] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $0.7 billion, Loans held for investment of $1.2 billion and Other assets of $0.1 billion at September 30, 2024. Comparable amounts at December 31, 2023 were $0.7 billion, $1.2 billion and $0.1 billion, respectively.

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