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Fair Value - Schedule of Fair Value Measurements - Nonrecurring Basis (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale, net | $ 160 | $ 179 |  | $ 179 |  | $ 160
Finance receivables and loans, net | 132,316 | 131,107 |  | 131,107 |  | 132,316
Goodwill impairment |  | 0 | $ 0 | 305 | $ 0 | 118
Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale, net | 143 | 179 |  | 179 |  | 143
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | 0 | 0 |  | 0 |  | 0
Goodwill impairment | 118 |  |  |  |  |
Assets | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total assets | 552 | 213 |  | 213 |  | 552
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (184) | (97) |  | (97) |  | (184)
Goodwill | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Goodwill | 362 |  |  |  |  | 362
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (118) |  |  |  |  | (118)
Repossessed and foreclosed assets | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 8 | 7 |  | 7 |  | 8
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (1) | (2) |  | (2) |  | (1)
Level 1 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale, net | 0 | 0 |  | 0 |  | 0
Level 1 | Assets | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total assets | 0 | 0 |  | 0 |  | 0
Level 1 | Goodwill | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Goodwill | 0 |  |  |  |  | 0
Level 1 | Repossessed and foreclosed assets | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 0 | 0 |  | 0 |  | 0
Level 2 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale, net | 0 | 0 |  | 0 |  | 0
Level 2 | Assets | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total assets | 0 | 0 |  | 0 |  | 0
Level 2 | Goodwill | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Goodwill | 0 |  |  |  |  | 0
Level 2 | Repossessed and foreclosed assets | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 0 | 0 |  | 0 |  | 0
Level 3 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held-for-sale, net | 143 | 179 |  | 179 |  | 143
Level 3 | Assets | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Total assets | 552 | 213 |  | 213 |  | 552
Level 3 | Goodwill | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Goodwill | 362 |  |  |  |  | 362
Level 3 | Repossessed and foreclosed assets | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other assets | 8 | 7 |  | 7 |  | 8
Commercial | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 39 | 27 |  | 27 |  | 39
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (65) | (95) |  | (95) |  | (65)
Commercial | Level 1 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 0 | 0 |  | 0 |  | 0
Commercial | Level 2 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 0 | 0 |  | 0 |  | 0
Commercial | Level 3 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 39 | 27 |  | 27 |  | 39
Automotive | Commercial | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 13 | 2 |  | 2 |  | 13
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (2) | 0 |  | 0 |  | (2)
Automotive | Commercial | Level 1 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 0 | 0 |  | 0 |  | 0
Automotive | Commercial | Level 2 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 0 | 0 |  | 0 |  | 0
Automotive | Commercial | Level 3 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 13 | 2 |  | 2 |  | 13
Other | Commercial | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 26 | 25 |  | 25 |  | 26
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (63) | (95) |  | (95) |  | (63)
Other | Commercial | Level 1 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 0 | 0 |  | 0 |  | 0
Other | Commercial | Level 2 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | 0 | 0 |  | 0 |  | 0
Other | Commercial | Level 3 | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Finance receivables and loans, net | $ 26 | $ 25 |  | $ 25 |  | $ 26

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