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Loans and Related Allowance for Credit Losses (Credit Quality Indicators for Residential Real Estate and Home Equity Loan Classes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Total loans, net | [1] | $ 316,467 | $ 321,508 |
Gross charge-offs |  |  |  |
Total |  | 1,435 | 1,092 | $ 985
Residential real estate |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 2,645 | 5,335 |
Year two |  | 4,595 | 10,064 |
Year three |  | 9,512 | 15,484 |
Year four |  | 14,637 | 6,832 |
Year five |  | 6,344 | 2,270 |
Prior |  | 8,682 | 7,559 |
Total loans, net |  | 46,415 | 47,544 |
Gross charge-offs |  |  |  |
Year One |  |  |  |
Year Two |  |  | 2 |
Year Three |  |  | 1 |
Year Four |  | 1 | 1 |
Year Five |  |  |  |
Prior |  | 2 | 4 |
Revolving Loans |  |  |  |
Revolving Loans Converted to Term |  |  |  |
Total |  | 3 | 8 |
Residential real estate | FICO Score, Greater Than Or Equal To 780 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 1,730 | 3,206 |
Year two |  | 3,264 | 7,797 |
Year three |  | 7,584 | 12,197 |
Year four |  | 11,723 | 5,035 |
Year five |  | 4,683 | 1,492 |
Prior |  | 4,858 | 4,004 |
Total loans, net |  | 33,842 | 33,731 |
Residential real estate | FICO Score, 720 to 779 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 789 | 1,482 |
Year two |  | 805 | 1,659 |
Year three |  | 1,406 | 2,389 |
Year four |  | 2,035 | 1,107 |
Year five |  | 1,004 | 432 |
Prior |  | 1,567 | 1,388 |
Total loans, net |  | 7,606 | 8,457 |
Residential real estate | FICO Score, 660 to 719 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 115 | 400 |
Year two |  | 270 | 508 |
Year three |  | 401 | 657 |
Year four |  | 620 | 334 |
Year five |  | 324 | 171 |
Prior |  | 784 | 721 |
Total loans, net |  | 2,514 | 2,791 |
Residential real estate | FICO Score, Less Than 660 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 9 | 93 |
Year two |  | 108 | 71 |
Year three |  | 90 | 133 |
Year four |  | 156 | 122 |
Year five |  | 116 | 82 |
Prior |  | 696 | 680 |
Total loans, net |  | 1,175 | 1,181 |
Residential real estate | No FICO score available |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 1 | 140 |
Year two |  | 132 | 9 |
Year three |  | 8 | 92 |
Year four |  | 86 | 168 |
Year five |  | 151 | 56 |
Prior |  | 280 | 266 |
Total loans, net |  | 658 | 731 |
Residential real estate | Government insured or guaranteed loans |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 1 | 14 |
Year two |  | 16 | 20 |
Year three |  | 23 | 16 |
Year four |  | 17 | 66 |
Year five |  | 66 | 37 |
Prior |  | 497 | 500 |
Total loans, net |  | 620 | 653 |
Residential real estate | Greater than 100% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 10 | 15 |
Year two |  | 55 | 139 |
Year three |  | 85 | 79 |
Year four |  | 52 | 31 |
Year five |  | 23 | 10 |
Prior |  | 32 | 28 |
Total loans, net |  | 257 | 302 |
Residential real estate | Greater than or equal to 80% to 100% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 591 | 1,665 |
Year two |  | 485 | 1,928 |
Year three |  | 954 | 955 |
Year four |  | 601 | 221 |
Year five |  | 171 | 69 |
Prior |  | 111 | 92 |
Total loans, net |  | 2,913 | 4,930 |
Residential real estate | Less than 80% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 2,043 | 3,585 |
Year two |  | 4,039 | 7,977 |
Year three |  | 8,450 | 14,421 |
Year four |  | 13,958 | 6,514 |
Year five |  | 6,084 | 2,154 |
Prior |  | 8,039 | 6,935 |
Total loans, net |  | 42,613 | 41,586 |
Residential real estate | No LTV available |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  | 56 |
Year two |  |  |  |
Year three |  |  | 13 |
Year four |  | 9 |  |
Year five |  |  |  |
Prior |  | 3 | 4 |
Total loans, net |  | 12 | 73 |
Home equity |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  |  |
Year three |  |  | 162 |
Year four |  | 147 | 1,918 |
Year five |  | 1,713 | 868 |
Prior |  | 2,854 | 2,592 |
Revolving Loans |  | 8,373 | 8,265 |
Revolving Loans Converted to Term |  | 12,904 | 12,345 |
Total loans, net |  | 25,991 | 26,150 |
Gross charge-offs |  |  |  |
Year One |  |  |  |
Year Two |  |  |  |
Year Three |  |  |  |
Year Four |  |  |  |
Year Five |  |  |  |
Prior |  | 1 | 4 |
Revolving Loans |  | 16 | 7 |
Revolving Loans Converted to Term |  | 19 | 10 |
Total |  | 36 | 21 |
Home equity | FICO Score, Greater Than Or Equal To 780 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  |  |
Year three |  |  | 102 |
Year four |  | 94 | 1,254 |
Year five |  | 1,145 | 489 |
Prior |  | 1,753 | 1,605 |
Revolving Loans |  | 4,720 | 4,604 |
Revolving Loans Converted to Term |  | 6,211 | 6,083 |
Total loans, net |  | 13,923 | 14,137 |
Home equity | FICO Score, 720 to 779 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  |  |
Year three |  |  | 38 |
Year four |  | 34 | 423 |
Year five |  | 352 | 216 |
Prior |  | 572 | 488 |
Revolving Loans |  | 2,251 | 2,222 |
Revolving Loans Converted to Term |  | 3,274 | 3,225 |
Total loans, net |  | 6,483 | 6,612 |
Home equity | FICO Score, 660 to 719 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  |  |
Year three |  |  | 17 |
Year four |  | 14 | 174 |
Year five |  | 151 | 110 |
Prior |  | 289 | 271 |
Revolving Loans |  | 1,193 | 1,207 |
Revolving Loans Converted to Term |  | 2,085 | 1,894 |
Total loans, net |  | 3,732 | 3,673 |
Home equity | FICO Score, Less Than 660 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  |  |
Year three |  |  | 5 |
Year four |  | 5 | 65 |
Year five |  | 63 | 52 |
Prior |  | 234 | 220 |
Revolving Loans |  | 202 | 223 |
Revolving Loans Converted to Term |  | 1,290 | 1,089 |
Total loans, net |  | 1,794 | 1,654 |
Home equity | No FICO score available |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  |  |
Year three |  |  |  |
Year four |  |  | 2 |
Year five |  | 2 | 1 |
Prior |  | 6 | 8 |
Revolving Loans |  | 7 | 9 |
Revolving Loans Converted to Term |  | 44 | 54 |
Total loans, net |  | 59 | 74 |
Home equity | Greater than 100% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  |  |
Year three |  |  | 1 |
Year four |  | 1 | 12 |
Year five |  | 12 | 6 |
Prior |  | 17 | 14 |
Revolving Loans |  | 368 | 306 |
Revolving Loans Converted to Term |  | 372 | 309 |
Total loans, net |  | 770 | 648 |
Home equity | Greater than or equal to 80% to 100% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  |  |
Year three |  |  | 4 |
Year four |  | 5 | 40 |
Year five |  | 31 | 17 |
Prior |  | 30 | 22 |
Revolving Loans |  | 1,098 | 1,116 |
Revolving Loans Converted to Term |  | 1,619 | 1,743 |
Total loans, net |  | 2,783 | 2,942 |
Home equity | Less than 80% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  |  |
Year three |  |  | 157 |
Year four |  | 141 | 1,866 |
Year five |  | 1,670 | 845 |
Prior |  | 2,807 | 2,556 |
Revolving Loans |  | 6,907 | 6,843 |
Revolving Loans Converted to Term |  | 10,913 | 10,293 |
Total loans, net |  | $ 22,438 | $ 22,560 |
[1] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $0.8 billion, Loans of $1.2 billion and Other assets of $0.1 billion at December 31, 2024. Comparable amounts at December 31, 2023 were $0.7 billion, $1.2 billion and $0.1 billion, respectively.

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