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Fair Value (Fair Value Measurements - Nonrecurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale, net | $ 358 | $ 400
Finance receivables and loans, net | 134,410 | 135,852
Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale, net | 331 | 375
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | 0 | 0
Assets | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 395 | 441
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (42) | (43)
Nonmarketable equity investments | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 5 | 1
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | 2 | 1
Repossessed and foreclosed assets | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 8 | 10
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (1) | (1)
Level 1 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale, net | 0 | 0
Level 1 | Assets | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 0 | 0
Level 1 | Nonmarketable equity investments | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 0 | 0
Level 1 | Repossessed and foreclosed assets | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 0 | 0
Level 2 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale, net | 0 | 0
Level 2 | Assets | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 3 | 0
Level 2 | Nonmarketable equity investments | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 3 | 0
Level 2 | Repossessed and foreclosed assets | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 0 | 0
Level 3 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale, net | 331 | 375
Level 3 | Assets | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 392 | 441
Level 3 | Nonmarketable equity investments | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 2 | 1
Level 3 | Repossessed and foreclosed assets | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets | 8 | 10
Commercial | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 51 | 55
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (43) | (43)
Commercial | Level 1 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 0 | 0
Commercial | Level 2 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 0 | 0
Commercial | Level 3 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 51 | 55
Automotive | Commercial | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 2 | 6
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | 0 | 0
Automotive | Commercial | Level 1 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 0 | 0
Automotive | Commercial | Level 2 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 0 | 0
Automotive | Commercial | Level 3 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 2 | 6
Other | Commercial | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 49 | 49
Lower-of-cost-or-fair-value reserve, valuation reserve, or cumulative adjustments | (43) | (43)
Other | Commercial | Level 1 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 0 | 0
Other | Commercial | Level 2 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | 0 | 0
Other | Commercial | Level 3 | Nonrecurring fair value measurements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Finance receivables and loans, net | $ 49 | $ 49

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