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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Total loans, net | [1] | $ 321,508 | $ 326,025 |
Gross charge-offs |  |  |  |
Total |  | 1,092 | 985 | $ 1,101
Residential real estate |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 5,335 | 10,594 |
Year two |  | 10,064 | 16,650 |
Year three |  | 15,484 | 7,392 |
Year four |  | 6,832 | 2,482 |
Year five |  | 2,270 | 878 |
Prior |  | 7,559 | 7,893 |
Total loans, net |  | 47,544 | 45,889 |
Gross charge-offs |  |  |  |
Year One |  |  |  |
Year Two |  | 2 |  |
Year Three |  | 1 |  |
Year Four |  | 1 |  |
Year Five |  |  |  |
Prior |  | 4 |  |
Revolving Loans |  |  |  |
Revolving Loans Converted to Term |  |  |  |
Total |  | 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 |  | 3,206 | 6,825 |
Year two |  | 7,797 | 12,596 |
Year three |  | 12,197 | 5,276 |
Year four |  | 5,035 | 1,623 |
Year five |  | 1,492 | 463 |
Prior |  | 4,004 | 4,027 |
Total loans, net |  | 33,731 | 30,810 |
Residential real estate | FICO Score, 720 to 779 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 1,482 | 3,172 |
Year two |  | 1,659 | 3,024 |
Year three |  | 2,389 | 1,369 |
Year four |  | 1,107 | 476 |
Year five |  | 432 | 180 |
Prior |  | 1,388 | 1,457 |
Total loans, net |  | 8,457 | 9,678 |
Residential real estate | FICO Score, 660 to 719 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 400 | 514 |
Year two |  | 508 | 744 |
Year three |  | 657 | 378 |
Year four |  | 334 | 189 |
Year five |  | 171 | 98 |
Prior |  | 721 | 796 |
Total loans, net |  | 2,791 | 2,719 |
Residential real estate | FICO Score, Less Than 660 |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 93 | 63 |
Year two |  | 71 | 108 |
Year three |  | 133 | 110 |
Year four |  | 122 | 88 |
Year five |  | 82 | 71 |
Prior |  | 680 | 740 |
Total loans, net |  | 1,181 | 1,180 |
Residential real estate | No FICO score available |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 140 | 11 |
Year two |  | 9 | 163 |
Year three |  | 92 | 193 |
Year four |  | 168 | 67 |
Year five |  | 56 | 38 |
Prior |  | 266 | 337 |
Total loans, net |  | 731 | 809 |
Residential real estate | Government insured or guaranteed loans |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 14 | 9 |
Year two |  | 20 | 15 |
Year three |  | 16 | 66 |
Year four |  | 66 | 39 |
Year five |  | 37 | 28 |
Prior |  | 500 | 536 |
Total loans, net |  | 653 | 693 |
Residential real estate | Greater than 100% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 15 | 4 |
Year two |  | 139 | 52 |
Year three |  | 79 | 20 |
Year four |  | 31 | 10 |
Year five |  | 10 | 4 |
Prior |  | 28 | 41 |
Total loans, net |  | 302 | 131 |
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 |  | 1,665 | 1,185 |
Year two |  | 1,928 | 678 |
Year three |  | 955 | 232 |
Year four |  | 221 | 84 |
Year five |  | 69 | 24 |
Prior |  | 92 | 92 |
Total loans, net |  | 4,930 | 2,295 |
Residential real estate | Less than 80% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  | 3,585 | 9,396 |
Year two |  | 7,977 | 15,844 |
Year three |  | 14,421 | 7,074 |
Year four |  | 6,514 | 2,346 |
Year five |  | 2,154 | 822 |
Prior |  | 6,935 | 7,220 |
Total loans, net |  | 41,586 | 42,702 |
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 |  |  | 61 |
Year three |  | 13 |  |
Year four |  |  | 3 |
Year five |  |  |  |
Prior |  | 4 | 4 |
Total loans, net |  | 73 | 68 |
Home equity |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  | 180 |
Year three |  | 162 | 2,143 |
Year four |  | 1,918 | 997 |
Year five |  | 868 | 291 |
Prior |  | 2,592 | 2,897 |
Revolving Loans |  | 8,265 | 8,902 |
Revolving Loans Converted to Term |  | 12,345 | 10,573 |
Total loans, net |  | 26,150 | 25,983 |
Gross charge-offs |  |  |  |
Year One |  |  |  |
Year Two |  |  |  |
Year Three |  |  |  |
Year Four |  |  |  |
Year Five |  |  |  |
Prior |  | 4 |  |
Revolving Loans |  | 7 |  |
Revolving Loans Converted to Term |  | 10 |  |
Total |  | 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 |  |  | 110 |
Year three |  | 102 | 1,357 |
Year four |  | 1,254 | 554 |
Year five |  | 489 | 155 |
Prior |  | 1,605 | 1,791 |
Revolving Loans |  | 4,604 | 5,093 |
Revolving Loans Converted to Term |  | 6,083 | 5,545 |
Total loans, net |  | 14,137 | 14,605 |
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 |  |  | 47 |
Year three |  | 38 | 515 |
Year four |  | 423 | 248 |
Year five |  | 216 | 64 |
Prior |  | 488 | 567 |
Revolving Loans |  | 2,222 | 2,305 |
Revolving Loans Converted to Term |  | 3,225 | 2,843 |
Total loans, net |  | 6,612 | 6,589 |
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 |  |  | 19 |
Year three |  | 17 | 211 |
Year four |  | 174 | 140 |
Year five |  | 110 | 42 |
Prior |  | 271 | 288 |
Revolving Loans |  | 1,207 | 1,146 |
Revolving Loans Converted to Term |  | 1,894 | 1,449 |
Total loans, net |  | 3,673 | 3,295 |
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 |  |  | 4 |
Year three |  | 5 | 57 |
Year four |  | 65 | 54 |
Year five |  | 52 | 29 |
Prior |  | 220 | 242 |
Revolving Loans |  | 223 | 342 |
Revolving Loans Converted to Term |  | 1,089 | 671 |
Total loans, net |  | 1,654 | 1,399 |
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 |  |  | 3 |
Year four |  | 2 | 1 |
Year five |  | 1 | 1 |
Prior |  | 8 | 9 |
Revolving Loans |  | 9 | 16 |
Revolving Loans Converted to Term |  | 54 | 65 |
Total loans, net |  | 74 | 95 |
Home equity | Greater than 100% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  | 4 |
Year three |  | 1 | 14 |
Year four |  | 12 | 9 |
Year five |  | 6 | 2 |
Prior |  | 14 | 15 |
Revolving Loans |  | 306 | 268 |
Revolving Loans Converted to Term |  | 309 | 137 |
Total loans, net |  | 648 | 449 |
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 |  |  | 4 |
Year three |  | 4 | 51 |
Year four |  | 40 | 27 |
Year five |  | 17 | 4 |
Prior |  | 22 | 31 |
Revolving Loans |  | 1,116 | 854 |
Revolving Loans Converted to Term |  | 1,743 | 1,149 |
Total loans, net |  | 2,942 | 2,120 |
Home equity | Less than 80% |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |
Year one |  |  |  |
Year two |  |  | 172 |
Year three |  | 157 | 2,078 |
Year four |  | 1,866 | 961 |
Year five |  | 845 | 285 |
Prior |  | 2,556 | 2,851 |
Revolving Loans |  | 6,843 | 7,780 |
Revolving Loans Converted to Term |  | 10,293 | 9,287 |
Total loans, net |  | $ 22,560 | $ 23,414 |
[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 of $1.2 billion and Other assets of $0.1 billion at December 31, 2023. Comparable amounts at December 31, 2022 were $0.9 billion, $1.3 billion and $0.1 billion, respectively.

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