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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Total loans, net | [1] | $ 321,429 |  | $ 321,429 |  | $ 321,508
Gross charge-offs |  |  |  |  |  |
Total |  | 375 | $ 293 | 705 | $ 575 |
Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 1,488 |  | 1,488 |  | 5,335
Year two |  | 4,986 |  | 4,986 |  | 10,064
Year three |  | 9,784 |  | 9,784 |  | 15,484
Year four |  | 15,070 |  | 15,070 |  | 6,832
Year five |  | 6,608 |  | 6,608 |  | 2,270
Prior |  | 9,247 |  | 9,247 |  | 7,559
Total loans, net |  | 47,183 |  | 47,183 |  | 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 |  | 156 |  | 156 |  | 1,918
Year five |  | 1,819 |  | 1,819 |  | 868
Prior |  | 3,155 |  | 3,155 |  | 2,592
Revolving Loans |  | 8,137 |  | 8,137 |  | 8,265
Revolving Loans Converted to Term |  | 12,650 |  | 12,650 |  | 12,345
Total loans, net |  | 25,917 |  | 25,917 |  | 26,150
Gross charge-offs |  |  |  |  |  |
Prior |  |  |  | 1 |  | 4
Revolving Loans |  |  |  | 9 |  | 7
Revolving Loans Converted to Term |  |  |  | 9 |  | 10
Total |  |  |  | 19 |  | 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 |  | 813 |  | 813 |  | 3,206
Year two |  | 3,411 |  | 3,411 |  | 7,797
Year three |  | 7,691 |  | 7,691 |  | 12,197
Year four |  | 12,061 |  | 12,061 |  | 5,035
Year five |  | 4,889 |  | 4,889 |  | 1,492
Prior |  | 5,190 |  | 5,190 |  | 4,004
Total loans, net |  | 34,055 |  | 34,055 |  | 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 |  | 100 |  | 100 |  | 1,254
Year five |  | 1,209 |  | 1,209 |  | 489
Prior |  | 1,930 |  | 1,930 |  | 1,605
Revolving Loans |  | 4,597 |  | 4,597 |  | 4,604
Revolving Loans Converted to Term |  | 6,203 |  | 6,203 |  | 6,083
Total loans, net |  | 14,039 |  | 14,039 |  | 14,137
720 to 779 | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 601 |  | 601 |  | 1,482
Year two |  | 1,030 |  | 1,030 |  | 1,659
Year three |  | 1,581 |  | 1,581 |  | 2,389
Year four |  | 2,160 |  | 2,160 |  | 1,107
Year five |  | 1,042 |  | 1,042 |  | 432
Prior |  | 1,684 |  | 1,684 |  | 1,388
Total loans, net |  | 8,098 |  | 8,098 |  | 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 |  | 36 |  | 36 |  | 423
Year five |  | 383 |  | 383 |  | 216
Prior |  | 643 |  | 643 |  | 488
Revolving Loans |  | 2,179 |  | 2,179 |  | 2,222
Revolving Loans Converted to Term |  | 3,243 |  | 3,243 |  | 3,225
Total loans, net |  | 6,484 |  | 6,484 |  | 6,612
660 to 719 | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 71 |  | 71 |  | 400
Year two |  | 286 |  | 286 |  | 508
Year three |  | 399 |  | 399 |  | 657
Year four |  | 594 |  | 594 |  | 334
Year five |  | 346 |  | 346 |  | 171
Prior |  | 827 |  | 827 |  | 721
Total loans, net |  | 2,523 |  | 2,523 |  | 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 |  | 166 |  | 166 |  | 110
Prior |  | 320 |  | 320 |  | 271
Revolving Loans |  | 1,155 |  | 1,155 |  | 1,207
Revolving Loans Converted to Term |  | 1,967 |  | 1,967 |  | 1,894
Total loans, net |  | 3,623 |  | 3,623 |  | 3,673
Less than 660 | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 2 |  | 2 |  | 93
Year two |  | 111 |  | 111 |  | 71
Year three |  | 84 |  | 84 |  | 133
Year four |  | 150 |  | 150 |  | 122
Year five |  | 110 |  | 110 |  | 82
Prior |  | 733 |  | 733 |  | 680
Total loans, net |  | 1,190 |  | 1,190 |  | 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 |  | 5 |  | 5 |  | 65
Year five |  | 59 |  | 59 |  | 52
Prior |  | 255 |  | 255 |  | 220
Revolving Loans |  | 199 |  | 199 |  | 223
Revolving Loans Converted to Term |  | 1,188 |  | 1,188 |  | 1,089
Total loans, net |  | 1,706 |  | 1,706 |  | 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 |  | 134 |  | 134 |  | 9
Year three |  | 8 |  | 8 |  | 92
Year four |  | 90 |  | 90 |  | 168
Year five |  | 157 |  | 157 |  | 56
Prior |  | 303 |  | 303 |  | 266
Total loans, net |  | 693 |  | 693 |  | 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 |  | 49 |  | 49 |  | 54
Total loans, net |  | 65 |  | 65 |  | 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 |  | 14 |  | 14 |  | 20
Year three |  | 21 |  | 21 |  | 16
Year four |  | 15 |  | 15 |  | 66
Year five |  | 64 |  | 64 |  | 37
Prior |  | 510 |  | 510 |  | 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 |  | 39 |  | 39 |  | 139
Year three |  | 133 |  | 133 |  | 79
Year four |  | 68 |  | 68 |  | 31
Year five |  | 30 |  | 30 |  | 10
Prior |  | 33 |  | 33 |  | 28
Total loans, net |  | 308 |  | 308 |  | 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 |  | 2 |  | 2 |  | 12
Year five |  | 12 |  | 12 |  | 6
Prior |  | 17 |  | 17 |  | 14
Revolving Loans |  | 336 |  | 336 |  | 306
Revolving Loans Converted to Term |  | 356 |  | 356 |  | 309
Total loans, net |  | 723 |  | 723 |  | 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 |  | 507 |  | 507 |  | 1,665
Year two |  | 838 |  | 838 |  | 1,928
Year three |  | 1,256 |  | 1,256 |  | 955
Year four |  | 740 |  | 740 |  | 221
Year five |  | 199 |  | 199 |  | 69
Prior |  | 147 |  | 147 |  | 92
Total loans, net |  | 3,687 |  | 3,687 |  | 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 |  | 34 |  | 34 |  | 17
Prior |  | 32 |  | 32 |  | 22
Revolving Loans |  | 1,068 |  | 1,068 |  | 1,116
Revolving Loans Converted to Term |  | 1,631 |  | 1,631 |  | 1,743
Total loans, net |  | 2,770 |  | 2,770 |  | 2,942
Less than 80% | Residential real estate |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 976 |  | 976 |  | 3,585
Year two |  | 4,054 |  | 4,054 |  | 7,977
Year three |  | 8,374 |  | 8,374 |  | 14,421
Year four |  | 14,236 |  | 14,236 |  | 6,514
Year five |  | 6,315 |  | 6,315 |  | 2,154
Prior |  | 8,554 |  | 8,554 |  | 6,935
Total loans, net |  | 42,509 |  | 42,509 |  | 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 |  | 149 |  | 149 |  | 1,866
Year five |  | 1,773 |  | 1,773 |  | 845
Prior |  | 3,106 |  | 3,106 |  | 2,556
Revolving Loans |  | 6,733 |  | 6,733 |  | 6,843
Revolving Loans Converted to Term |  | 10,663 |  | 10,663 |  | 10,293
Total loans, net |  | 22,424 |  | 22,424 |  | 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 |  | 41 |  | 41 |  |
Year three |  |  |  |  |  | 13
Year four |  | 11 |  | 11 |  |
Year five |  |  |  |  |  |
Prior |  | 3 |  | 3 |  | 4
Total loans, net |  | $ 55 |  | $ 55 |  | $ 73
[1] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $0.9 billion, Loans held for investment of $1.2 billion and Other assets of $0.1 billion at June 30, 2024. Comparable amounts at December 31, 2023 were $0.7 billion, $1.2 billion and $0.1 billion, respectively.

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