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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