| **Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions** | 3 Months Ended | 9 Months Ended |
|-------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Revenues**                                                                                                |           |           |   |   |
| Net earned premiums                                                                                         | $ 1,953        | $ 1,890        | $ 5,672 | $ 5,517 |
| Net investment income                                                                                       | 517            | 487            | 1,380 | 1,573 |
| Net investment gains (losses)                                                                               | 27             | 7              | (120) | 20 |
| Non-insurance warranty revenue                                                                              | 317            | 292            | 926 | 858 |
| Other revenues                                                                                              | 6              | 9              | 19 | 22 |
| Total revenues                                                                                              | 2,820          | 2,685          | 7,877 | 7,990 |
| **Claims, Benefits and Expenses**                                                                           |           |           |   |   |
| Insurance claims and policyholders’ benefits                                                          | 1,616          | 1,614          | 4,683 | 4,323 |
| Amortization of deferred acquisition costs                                                                  | 360            | 345            | 1,046 | 1,025 |
| Non-insurance warranty expense                                                                              | 293            | 278            | 859 | 801 |
| Other operating expenses                                                                                    | 269            | 289            | 852 | 853 |
| Interest                                                                                                    | 32             | 32             | 94 | 100 |
| Total claims, benefits and expenses                                                                         | 2,570          | 2,558          | 7,534 | 7,102 |
| Income before income tax                                                                                    | 250            | 127            | 343 | 888 |
| Income tax expense                                                                                          | (37)           | (20)           | (40) | (161) |
| Net income                                                                                                  | $ 213          | $ 107          | $ 303 | $ 727 |
| Basic earnings per share (in usd per share)                                                                 | $ 0.79         | $ 0.39         | $ 1.12 | $ 2.68 |
| Diluted earnings per share (in usd per share)                                                               | $ 0.79         | $ 0.39         | $ 1.11 | $ 2.67 |
| **Weighted Average Outstanding Common Stock and Common Stock Equivalents**                                  |           |           |   |   |
| Basic (in shares)                                                                                           | 271.7          | 271.6          | 271.6 | 271.6 |
| Diluted (in shares)                                                                                         | 272.3          | 272.6          | 272.3 | 272.5 |

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Insurance claims and policyholders' benefits, including policyholders' dividends
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Investments and Derivatives, Realized Gain (Loss)
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The income earned from investments in securities and property, equipment and other capital assets. It includes rent from property and equipment, dividends from shares in corporations, and interest from bonds, loans, mortgages, derivatives, commercial paper, bank accounts, certificates of deposits, treasuries, and other financial securities. It also includes realized gains and losses on trading securities.
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Weighted Average Number of Shares Oustanding - Basic and Diluted [Abstract]
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| - Definition
The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.
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| - Definition
Amount of amortization expense (reversal of expense) for deferred policy acquisition costs.
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| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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| - Definition
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 of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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Amount of the cost of borrowed funds accounted for as interest expense.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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Amount of revenue and income classified as other.
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| - Definition
Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, excluding 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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| - Definition
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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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
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