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Loans and Related Allowance for Credit Losses (Credit Quality Indicators for Automobile, Credit Card, Education and Other Consumer Loan Classes) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Total loans, net | [1] | $ 326,616 |  | $ 326,616 |  | $ 316,467
Gross charge-offs |  |  |  |  |  |
Total |  | 284 | $ 376 | 920 | $ 1,081 |
Automobile |  |  |  |  |  |
Gross charge-offs |  |  |  |  |  |
Year one |  |  |  | 3 |  | 9
Year two |  |  |  | 28 |  | 44
Year three |  |  |  | 30 |  | 27
Year four |  |  |  | 16 |  | 17
Year five |  |  |  | 9 |  | 12
Prior |  |  |  | 11 |  | 22
Revolving Loans |  |  |  | 0 |  | 0
Revolving Loans Converted to Term |  |  |  | 0 |  | 0
Total |  |  |  | 97 |  | 131
Automobile | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 6,051 |  | 6,051 |  | 6,544
Year two |  | 4,748 |  | 4,748 |  | 3,862
Year three |  | 2,643 |  | 2,643 |  | 2,328
Year four |  | 1,522 |  | 1,522 |  | 1,681
Year five |  | 961 |  | 961 |  | 539
Prior |  | 347 |  | 347 |  | 401
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 16,272 |  | 16,272 |  | 15,355
Automobile | Greater than or equal to 780 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 3,417 |  | 3,417 |  | 3,288
Year two |  | 2,211 |  | 2,211 |  | 1,717
Year three |  | 1,177 |  | 1,177 |  | 1,094
Year four |  | 715 |  | 715 |  | 865
Year five |  | 491 |  | 491 |  | 241
Prior |  | 129 |  | 129 |  | 125
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 8,140 |  | 8,140 |  | 7,330
Automobile | 720 to 779 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 1,826 |  | 1,826 |  | 2,047
Year two |  | 1,429 |  | 1,429 |  | 1,123
Year three |  | 710 |  | 710 |  | 636
Year four |  | 388 |  | 388 |  | 415
Year five |  | 222 |  | 222 |  | 129
Prior |  | 78 |  | 78 |  | 90
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 4,653 |  | 4,653 |  | 4,440
Automobile | 660 to 719 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 655 |  | 655 |  | 963
Year two |  | 757 |  | 757 |  | 671
Year three |  | 446 |  | 446 |  | 367
Year four |  | 234 |  | 234 |  | 227
Year five |  | 129 |  | 129 |  | 82
Prior |  | 58 |  | 58 |  | 74
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 2,279 |  | 2,279 |  | 2,384
Automobile | Less than 660 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 153 |  | 153 |  | 246
Year two |  | 351 |  | 351 |  | 351
Year three |  | 310 |  | 310 |  | 231
Year four |  | 185 |  | 185 |  | 174
Year five |  | 119 |  | 119 |  | 87
Prior |  | 82 |  | 82 |  | 112
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 1,200 |  | 1,200 |  | 1,201
Credit card |  |  |  |  |  |
Gross charge-offs |  |  |  |  |  |
Year one |  |  |  | 0 |  | 0
Year two |  |  |  | 0 |  | 0
Year three |  |  |  | 0 |  | 0
Year four |  |  |  | 0 |  | 0
Year five |  |  |  | 0 |  | 0
Prior |  |  |  | 0 |  | 0
Revolving Loans |  |  |  | 216 |  | 316
Revolving Loans Converted to Term |  |  |  | 31 |  | 39
Total |  |  |  | 247 |  | 355
Credit card | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 0
Year five |  | 0 |  | 0 |  | 0
Prior |  | 0 |  | 0 |  | 0
Revolving Loans |  | 6,556 |  | 6,556 |  | 6,797
Revolving Loans Converted to Term |  | 80 |  | 80 |  | 82
Total loans, net |  | 6,636 |  | 6,636 |  | 6,879
Credit card | Greater than or equal to 780 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 0
Year five |  | 0 |  | 0 |  | 0
Prior |  | 0 |  | 0 |  | 0
Revolving Loans |  | 2,013 |  | 2,013 |  | 2,090
Revolving Loans Converted to Term |  | 2 |  | 2 |  | 2
Total loans, net |  | 2,015 |  | 2,015 |  | 2,092
Credit card | 720 to 779 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 0
Year five |  | 0 |  | 0 |  | 0
Prior |  | 0 |  | 0 |  | 0
Revolving Loans |  | 1,789 |  | 1,789 |  | 1,859
Revolving Loans Converted to Term |  | 5 |  | 5 |  | 5
Total loans, net |  | 1,794 |  | 1,794 |  | 1,864
Credit card | 660 to 719 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 0
Year five |  | 0 |  | 0 |  | 0
Prior |  | 0 |  | 0 |  | 0
Revolving Loans |  | 1,752 |  | 1,752 |  | 1,815
Revolving Loans Converted to Term |  | 16 |  | 16 |  | 16
Total loans, net |  | 1,768 |  | 1,768 |  | 1,831
Credit card | Less than 660 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 0
Year five |  | 0 |  | 0 |  | 0
Prior |  | 0 |  | 0 |  | 0
Revolving Loans |  | 902 |  | 902 |  | 936
Revolving Loans Converted to Term |  | 55 |  | 55 |  | 57
Total loans, net |  | 957 |  | 957 |  | 993
Credit card | No FICO score available or required | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 0
Year five |  | 0 |  | 0 |  | 0
Prior |  | 0 |  | 0 |  | 0
Revolving Loans |  | 100 |  | 100 |  | 97
Revolving Loans Converted to Term |  | 2 |  | 2 |  | 2
Total loans, net |  | 102 |  | 102 |  | 99
Education |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 52 |  | 52 |  | 70
Year two |  | 88 |  | 88 |  | 116
Year three |  | 100 |  | 100 |  | 139
Year four |  | 121 |  | 121 |  | 67
Year five |  | 57 |  | 57 |  | 53
Prior |  | 1,103 |  | 1,103 |  | 1,191
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 1,521 |  | 1,521 |  | 1,636
Gross charge-offs |  |  |  |  |  |
Year one |  |  |  | 0 |  | 0
Year two |  |  |  | 0 |  | 0
Year three |  |  |  | 1 |  | 1
Year four |  |  |  | 1 |  | 1
Year five |  |  |  | 1 |  | 1
Prior |  |  |  | 9 |  | 16
Revolving Loans |  |  |  | 0 |  | 0
Revolving Loans Converted to Term |  |  |  | 0 |  | 0
Total |  |  |  | 12 |  | 19
Education | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 52 |  | 52 |  | 70
Year two |  | 88 |  | 88 |  | 116
Year three |  | 100 |  | 100 |  | 139
Year four |  | 121 |  | 121 |  | 67
Year five |  | 57 |  | 57 |  | 53
Prior |  | 463 |  | 463 |  | 500
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 881 |  | 881 |  | 945
Education | Greater than or equal to 780 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 13 |  | 13 |  | 22
Year two |  | 43 |  | 43 |  | 58
Year three |  | 50 |  | 50 |  | 79
Year four |  | 71 |  | 71 |  | 39
Year five |  | 34 |  | 34 |  | 33
Prior |  | 296 |  | 296 |  | 318
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 507 |  | 507 |  | 549
Education | 720 to 779 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 17 |  | 17 |  | 20
Year two |  | 27 |  | 27 |  | 36
Year three |  | 30 |  | 30 |  | 38
Year four |  | 32 |  | 32 |  | 20
Year five |  | 15 |  | 15 |  | 14
Prior |  | 105 |  | 105 |  | 116
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 226 |  | 226 |  | 244
Education | 660 to 719 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 8 |  | 8 |  | 13
Year two |  | 10 |  | 10 |  | 14
Year three |  | 12 |  | 12 |  | 15
Year four |  | 12 |  | 12 |  | 6
Year five |  | 6 |  | 6 |  | 5
Prior |  | 43 |  | 43 |  | 46
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 91 |  | 91 |  | 99
Education | Less than 660 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 2 |  | 2 |  | 3
Year two |  | 2 |  | 2 |  | 3
Year three |  | 4 |  | 4 |  | 3
Year four |  | 3 |  | 3 |  | 1
Year five |  | 1 |  | 1 |  | 1
Prior |  | 19 |  | 19 |  | 19
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 31 |  | 31 |  | 30
Education | No FICO score available or required | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 12 |  | 12 |  | 12
Year two |  | 6 |  | 6 |  | 5
Year three |  | 4 |  | 4 |  | 4
Year four |  | 3 |  | 3 |  | 1
Year five |  | 1 |  | 1 |  | 0
Prior |  | 0 |  | 0 |  | 1
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 26 |  | 26 |  | 23
Education | Other internal credit metrics |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 0 |  | 0 |  | 0
Year two |  | 0 |  | 0 |  | 0
Year three |  | 0 |  | 0 |  | 0
Year four |  | 0 |  | 0 |  | 0
Year five |  | 0 |  | 0 |  | 0
Prior |  | 640 |  | 640 |  | 691
Revolving Loans |  | 0 |  | 0 |  | 0
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 0
Total loans, net |  | 640 |  | 640 |  | 691
Other consumer |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 678 |  | 678 |  | 766
Year two |  | 516 |  | 516 |  | 409
Year three |  | 256 |  | 256 |  | 317
Year four |  | 168 |  | 168 |  | 90
Year five |  | 43 |  | 43 |  | 36
Prior |  | 106 |  | 106 |  | 113
Revolving Loans |  | 2,457 |  | 2,457 |  | 2,284
Revolving Loans Converted to Term |  | 9 |  | 9 |  | 12
Total loans, net |  | 4,233 |  | 4,233 |  | 4,027
Gross charge-offs |  |  |  |  |  |
Year one |  |  |  | 60 |  | 76
Year two |  |  |  | 19 |  | 27
Year three |  |  |  | 16 |  | 26
Year four |  |  |  | 10 |  | 13
Year five |  |  |  | 3 |  | 8
Prior |  |  |  | 3 |  | 9
Revolving Loans |  |  |  | 7 |  | 11
Revolving Loans Converted to Term |  |  |  | 0 |  | 1
Total |  |  |  | 118 |  | 171
Other consumer | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 671 |  | 671 |  | 760
Year two |  | 511 |  | 511 |  | 400
Year three |  | 237 |  | 237 |  | 240
Year four |  | 123 |  | 123 |  | 78
Year five |  | 33 |  | 33 |  | 25
Prior |  | 16 |  | 16 |  | 23
Revolving Loans |  | 208 |  | 208 |  | 228
Revolving Loans Converted to Term |  | 2 |  | 2 |  | 4
Total loans, net |  | 1,801 |  | 1,801 |  | 1,758
Other consumer | Greater than or equal to 780 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 212 |  | 212 |  | 245
Year two |  | 156 |  | 156 |  | 129
Year three |  | 73 |  | 73 |  | 64
Year four |  | 32 |  | 32 |  | 20
Year five |  | 9 |  | 9 |  | 5
Prior |  | 4 |  | 4 |  | 6
Revolving Loans |  | 34 |  | 34 |  | 37
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 1
Total loans, net |  | 520 |  | 520 |  | 507
Other consumer | 720 to 779 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 244 |  | 244 |  | 292
Year two |  | 181 |  | 181 |  | 141
Year three |  | 77 |  | 77 |  | 70
Year four |  | 35 |  | 35 |  | 21
Year five |  | 8 |  | 8 |  | 6
Prior |  | 4 |  | 4 |  | 6
Revolving Loans |  | 65 |  | 65 |  | 72
Revolving Loans Converted to Term |  | 1 |  | 1 |  | 1
Total loans, net |  | 615 |  | 615 |  | 609
Other consumer | 660 to 719 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 185 |  | 185 |  | 203
Year two |  | 133 |  | 133 |  | 97
Year three |  | 61 |  | 61 |  | 72
Year four |  | 36 |  | 36 |  | 22
Year five |  | 9 |  | 9 |  | 8
Prior |  | 5 |  | 5 |  | 6
Revolving Loans |  | 71 |  | 71 |  | 79
Revolving Loans Converted to Term |  | 0 |  | 0 |  | 1
Total loans, net |  | 500 |  | 500 |  | 488
Other consumer | Less than 660 | Using FICO Credit Metric |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 30 |  | 30 |  | 20
Year two |  | 41 |  | 41 |  | 33
Year three |  | 26 |  | 26 |  | 34
Year four |  | 20 |  | 20 |  | 15
Year five |  | 7 |  | 7 |  | 6
Prior |  | 3 |  | 3 |  | 5
Revolving Loans |  | 38 |  | 38 |  | 40
Revolving Loans Converted to Term |  | 1 |  | 1 |  | 1
Total loans, net |  | 166 |  | 166 |  | 154
Other consumer | Other internal credit metrics |  |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |  |
Year one |  | 7 |  | 7 |  | 6
Year two |  | 5 |  | 5 |  | 9
Year three |  | 19 |  | 19 |  | 77
Year four |  | 45 |  | 45 |  | 12
Year five |  | 10 |  | 10 |  | 11
Prior |  | 90 |  | 90 |  | 90
Revolving Loans |  | 2,249 |  | 2,249 |  | 2,056
Revolving Loans Converted to Term |  | 7 |  | 7 |  | 8
Total loans, net |  | $ 2,432 |  | $ 2,432 |  | $ 2,269
[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 $1.1 billion and Other assets of $0.2 billion at September 30, 2025. Comparable amounts at December 31, 2024 were $0.8 billion, $1.2 billion and $0.1 billion, respectively.

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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
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- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + Details
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