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Segment Reporting - Segment Results and Reconciliations to GAAP - Reportable Segment Significant Operating Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Servicing expenses | $ 32 | $ 23 | $ 67 | $ 48
Information technology expenses | 28 | 34 | 59 | 71
Corporate expenses | 20 | 24 | 45 | 55
Other/remaining expenses | 20 | 85 | 56 | 176
Total operating expenses | 100 | 166 | 227 | 350
Federal Education Loans [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Servicing expenses | 16 | 10 | 34 | 22
Information technology expenses | 0 | 3 | 0 | 6
Corporate expenses | 0 | 1 | 1 | 2
Other/remaining expenses | 1 | 2 | 2 | 3
Total operating expenses | 17 | 16 | 37 | 33
Consumer Lending Segment [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Servicing expenses | 14 | 13 | 28 | 26
Information technology expenses | 8 | 7 | 17 | 14
Corporate expenses | 1 | 1 | 1 | 2
Other/remaining expenses | 13 | 13 | 24 | 25
Total operating expenses | 36 | 34 | 70 | 67
Business Processing [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Servicing expenses | 0 | 0 | 0 | 0
Information technology expenses | 0 | 4 | 1 | 9
Corporate expenses | 0 | 1 | 0 | 2
Other/remaining expenses | 0 | 57 | 19 | 120
Total operating expenses | 0 | 62 | 20 | 131
Other Segment [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Servicing expenses | 2 | 0 | 5 | 0
Information technology expenses | 20 | 20 | 41 | 42
Corporate expenses | 19 | 21 | 43 | 49
Other/remaining expenses | 6 | 13 | 11 | 28
Total operating expenses | $ 47 | $ 54 | $ 100 | $ 119

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