| **General (Impact of Adoption on Condensed Balance Sheet and Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |        |        |
|---------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|--------|--------|
||
| **Statement of operations:**                                                                                                                      |           |           |   |   |   |   |
| Non-insurance warranty revenue                                                                                                                    | $ 258          | $ 99           | $ 744  | $ 290  |   |   |
| Total revenues                                                                                                                                    | 2,622          | 2,398          | 7,731  | 7,094  |   |   |
| Non-insurance warranty expense                                                                                                                    | 235            | 74             | 676    | 216    |   |   |
| Total claims, benefits and expenses                                                                                                               | 2,220          | 2,211          | 6,653  | 6,194  |   |   |
| Income before income tax                                                                                                                          | 402            | 187            | 1,078  | 900    |   |   |
| Income tax expense                                                                                                                                | (66)           | (43)           | (181)  | (224)  |   |   |
| Net income                                                                                                                                        | 336            | $ 144          | 897    | $ 676  |   |   |
| **Balance sheets:**                                                                                                                               |           |           |   |   |   |   |
| Other assets                                                                                                                                      | 3,589          |           | 3,589  |   | $ 3,015 | $ 1,133 |
| Other liabilities                                                                                                                                 | 6,571          |           | 6,571  |   | 6,222 | 4,253 |
| Deferred income taxes                                                                                                                             | 314            |           | 314    |   | 158 | 137 |
| Retained earnings                                                                                                                                 | 9,456          |           | 9,456  |   | 9,348 | 9,414 |
| Prior to Adoption                                                                                                                                 |           |           |   |   |   |   |
| **Statement of operations:**                                                                                                                      |           |           |   |   |   |   |
| Non-insurance warranty revenue                                                                                                                    | 109            |           | 315    |   |   |   |
| Total revenues                                                                                                                                    | 2,473          |           | 7,302  |   |   |   |
| Non-insurance warranty expense                                                                                                                    | 82             |           | 240    |   |   |   |
| Total claims, benefits and expenses                                                                                                               | 2,067          |           | 6,217  |   |   |   |
| Income before income tax                                                                                                                          | 406            |           | 1,085  |   |   |   |
| Income tax expense                                                                                                                                | (67)           |           | (183)  |   |   |   |
| Net income                                                                                                                                        | 339            |           | 902    |   |   |   |
| **Balance sheets:**                                                                                                                               |           |           |   |   |   |   |
| Other assets                                                                                                                                      | 3,284          |           | 3,284  |   |   | 1,133 |
| Other liabilities                                                                                                                                 | 6,259          |           | 6,259  |   |   | 4,253 |
| Deferred income taxes                                                                                                                             | 312            |           | 312    |   |   | 137 |
| Retained earnings                                                                                                                                 | 9,461          |           | 9,461  |   |   | $ 9,414 |
| Effect of Adoption                                                                                                                                |           |           |   |   |   |   |
| **Statement of operations:**                                                                                                                      |           |           |   |   |   |   |
| Non-insurance warranty revenue                                                                                                                    | 149            |           | 429    |   |   |   |
| Total revenues                                                                                                                                    | 149            |           | 429    |   |   |   |
| Non-insurance warranty expense                                                                                                                    | 153            |           | 436    |   |   |   |
| Total claims, benefits and expenses                                                                                                               | 153            |           | 436    |   |   |   |
| Income before income tax                                                                                                                          | (4)            |           | (7)    |   |   |   |
| Income tax expense                                                                                                                                | 1              |           | 2      |   |   |   |
| Net income                                                                                                                                        | (3)            |           | (5)    |   |   |   |
| **Balance sheets:**                                                                                                                               |           |           |   |   |   |   |
| Other assets                                                                                                                                      | 305            |           | 305    |   | 1,882 |   |
| Other liabilities                                                                                                                                 | 312            |           | 312    |   | 1,969 |   |
| Deferred income taxes                                                                                                                             | 2              |           | 2      |   | 21 |   |
| Retained earnings                                                                                                                                 | $ (5)          |           | $ (5)  |   | $ (66) |   |

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.
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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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