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Fair Value (Fair Value Measurements - Nonrecurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans held-for-sale, net | $ 404 |  | $ 404 |  | $ 158
Finance receivables and loans, net | 114,880 |  | 114,880 |  | 126,968
Goodwill impairment | 50 | $ 0 | 50 | $ 0 |
Loans held-for-sale | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans held-for-sale, net | 313 |  | 313 |  | 128
Lower of cost or fair value, valuation reserve, or cumulative adjustments | 0 |  | 0 |  | 0
Nonmarketable equity investments | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 5 |  | 5 |  | 12
Lower of cost or fair value, valuation reserve, or cumulative adjustments | (4) |  | (4) |  | 0
Goodwill | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 143 |  | 143 |  |
Lower of cost or fair value, valuation reserve, or cumulative adjustments | (50) |  | (50) |  |
Repossessed And Foreclosed Assets Member | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 8 |  | 8 |  | 12
Lower of cost or fair value, valuation reserve, or cumulative adjustments | 0 |  | 0 |  | (1)
Assets | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, fair value | 566 |  | 566 |  | 265
Lower of cost or fair value, valuation reserve, or cumulative adjustments | (81) |  | (81) |  | (40)
Equity Method Investments | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure |  |  |  |  | 4
Lower of cost or fair value, valuation reserve, or cumulative adjustments |  |  |  |  | (6)
Fair value, inputs, level 1 | Loans held-for-sale | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans held-for-sale, net | 0 |  | 0 |  | 0
Fair value, inputs, level 1 | Nonmarketable equity investments | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 0 |  | 0 |  | 0
Fair value, inputs, level 1 | Goodwill | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 0 |  | 0 |  |
Fair value, inputs, level 1 | Repossessed And Foreclosed Assets Member | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 0 |  | 0 |  | 0
Fair value, inputs, level 1 | Assets | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, fair value | 0 |  | 0 |  | 0
Fair value, inputs, level 1 | Equity Method Investments | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure |  |  |  |  | 0
Fair value, inputs, level 2 | Loans held-for-sale | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans held-for-sale, net | 0 |  | 0 |  | 0
Fair value, inputs, level 2 | Nonmarketable equity investments | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 0 |  | 0 |  | 5
Fair value, inputs, level 2 | Goodwill | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 0 |  | 0 |  |
Fair value, inputs, level 2 | Repossessed And Foreclosed Assets Member | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 0 |  | 0 |  | 0
Fair value, inputs, level 2 | Assets | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, fair value | 0 |  | 0 |  | 5
Fair value, inputs, level 2 | Equity Method Investments | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure |  |  |  |  | 0
Fair value, inputs, level 3 | Loans held-for-sale | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loans held-for-sale, net | 313 |  | 313 |  | 128
Fair value, inputs, level 3 | Nonmarketable equity investments | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 5 |  | 5 |  | 7
Fair value, inputs, level 3 | Goodwill | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 143 |  | 143 |  |
Fair value, inputs, level 3 | Repossessed And Foreclosed Assets Member | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure | 8 |  | 8 |  | 12
Fair value, inputs, level 3 | Assets | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, fair value | 566 |  | 566 |  | 260
Fair value, inputs, level 3 | Equity Method Investments | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other Assets, Fair Value Disclosure |  |  |  |  | 4
Commercial portfolio segment | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 97 |  | 97 |  | 109
Lower of cost or fair value, valuation reserve, or cumulative adjustments | (27) |  | (27) |  | (33)
Commercial portfolio segment | Fair value, inputs, level 1 | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 0 |  | 0 |  | 0
Commercial portfolio segment | Fair value, inputs, level 2 | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 0 |  | 0 |  | 0
Commercial portfolio segment | Fair value, inputs, level 3 | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 97 |  | 97 |  | 109
Automotive loan | Commercial portfolio segment | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 53 |  | 53 |  | 64
Lower of cost or fair value, valuation reserve, or cumulative adjustments | (17) |  | (17) |  | (12)
Automotive loan | Commercial portfolio segment | Fair value, inputs, level 1 | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 0 |  | 0 |  | 0
Automotive loan | Commercial portfolio segment | Fair value, inputs, level 2 | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 0 |  | 0 |  | 0
Automotive loan | Commercial portfolio segment | Fair value, inputs, level 3 | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 53 |  | 53 |  | 64
Other loan | Commercial portfolio segment | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 44 |  | 44 |  | 45
Lower of cost or fair value, valuation reserve, or cumulative adjustments | (10) |  | (10) |  | (21)
Other loan | Commercial portfolio segment | Fair value, inputs, level 1 | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 0 |  | 0 |  | 0
Other loan | Commercial portfolio segment | Fair value, inputs, level 2 | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | 0 |  | 0 |  | 0
Other loan | Commercial portfolio segment | Fair value, inputs, level 3 | Fair Value, measurements, nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Finance receivables and loans, net | $ 44 |  | 44 |  | $ 45
Corporate and Other |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Goodwill impairment |  |  | $ 50 |  |

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