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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | $ 179 | $ 183 | $ 365 | $ 362 |  |  |  |
Other revenue | 555 | 395 | 821 | 861 |  |  |  |
Remarketing losses (gains), net | 11 | (23) | 9 | (38) |  |  |  |
Corporate and Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 15 | 21 | 32 | 43 |  |  |  |
Other revenue | 52 | 34 | 111 | 59 |  |  |  |
Automotive Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 18 | 24 | 40 | 47 |  |  |  |
Other revenue | 40 | 61 | 87 | 129 |  |  |  |
Insurance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 146 | 138 | 293 | 272 |  |  |  |
Other revenue | 438 | 286 | 575 | 646 |  |  |  |
Mortgage Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Other revenue | 19 | 4 | 29 | 6 |  |  |  |
Corporate Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Other revenue | 6 | 10 | 19 | 21 |  |  |  |
Noninsurance contracts |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 142 | 134 | 285 | 265 |  |  |  |
Unearned revenue, remaining performance obligation, amount | 2,900 | 2,800 | 2,900 | 2,800 | $ 2,900 | $ 2,900 | $ 2,700 | $ 2,600
Unearned revenue, revenue recognized | 211 | 202 | 425 | 401 |  |  |  |
Capitalized contract cost, net | 1,800 | 1,600 | 1,800 | 1,600 | $ 1,700 | $ 1,700 | $ 1,600 | $ 1,500
Capitalized contract cost, amortization | 121 | 114 | 246 | 225 |  |  |  |
Noninsurance contracts | 2020 |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Unearned revenue, remaining performance obligation, amount | 406 |  | 406 |  |  |  |  |
Noninsurance contracts | 2021 |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Unearned revenue, remaining performance obligation, amount | 747 |  | 747 |  |  |  |  |
Noninsurance contracts | 2022 |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Unearned revenue, remaining performance obligation, amount | 649 |  | 649 |  |  |  |  |
Noninsurance contracts | 2023 |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Unearned revenue, remaining performance obligation, amount | 520 |  | 520 |  |  |  |  |
Noninsurance contracts | 2024 and thereafter |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Unearned revenue, remaining performance obligation, amount | 596 |  | 596 |  |  |  |  |
Noninsurance contracts | Corporate and Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Noninsurance contracts | Automotive Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Noninsurance contracts | Insurance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 142 | 134 | 285 | 265 |  |  |  |
Noninsurance contracts | Mortgage Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Noninsurance contracts | Corporate Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Remarketing fee income |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 15 | 19 | 32 | 37 |  |  |  |
Remarketing fee income | Corporate and Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Remarketing fee income | Automotive Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 15 | 19 | 32 | 37 |  |  |  |
Remarketing fee income | Insurance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Remarketing fee income | Mortgage Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Remarketing fee income | Corporate Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Brokerage commissions and other revenue |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 14 | 17 | 27 | 34 |  |  |  |
Brokerage commissions and other revenue | Corporate and Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 14 | 17 | 27 | 34 |  |  |  |
Brokerage commissions and other revenue | Automotive Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Brokerage commissions and other revenue | Insurance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Brokerage commissions and other revenue | Mortgage Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Brokerage commissions and other revenue | Corporate Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Brokered/agent commissions |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 4 | 4 | 8 | 7 |  |  |  |
Brokered/agent commissions | Corporate and Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Brokered/agent commissions | Automotive Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Brokered/agent commissions | Insurance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 4 | 4 | 8 | 7 |  |  |  |
Brokered/agent commissions | Mortgage Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Brokered/agent commissions | Corporate Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Deposits and Banking |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 1 | 4 | 5 | 9 |  |  |  |
Deposits and Banking | Corporate and Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 1 | 4 | 5 | 9 |  |  |  |
Deposits and Banking | Automotive Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Deposits and Banking | Insurance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Deposits and Banking | Mortgage Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Deposits and Banking | Corporate Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 3 | 5 | 8 | 10 |  |  |  |
Other | Corporate and Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Other | Automotive Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 3 | 5 | 8 | 10 |  |  |  |
Other | Insurance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Other | Mortgage Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Other | Corporate Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contracts with customers | 0 | 0 | 0 | 0 |  |  |  |
Out of scope of Topic 606 |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Other revenue | 376 | 212 | 456 | 499 |  |  |  |
Out of scope of Topic 606 | Corporate and Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Other revenue | 37 | 13 | 79 | 16 |  |  |  |
Out of scope of Topic 606 | Automotive Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Other revenue | 22 | 37 | 47 | 82 |  |  |  |
Out of scope of Topic 606 | Insurance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Other revenue | 292 | 148 | 282 | 374 |  |  |  |
Out of scope of Topic 606 | Mortgage Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Other revenue | 19 | 4 | 29 | 6 |  |  |  |
Out of scope of Topic 606 | Corporate Finance operations | Operating Segments |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Other revenue | $ 6 | $ 10 | $ 19 | $ 21 |  |  |  |

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