| **Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Cash Flows) (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Cash Flows from Operating Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Net income                                                                                                                                                                                              | $ 223          | $ 144           | $ 272 | $ 260 | $ 241 | $ 343 | $ 209 | $ 66 | $ 899 | $ 859 | $ 479 |
| **Adjustments to reconcile net income to net cash flows provided by operating activities:**                                                                                                             |           |            |   |   |   |   |   |   |   |   |   |
| Net realized investment losses (gains)                                                                                                                                                                  |           |            |   |   |   |   |   |   | (93) | (50) | 67 |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 38 | 29 | (2) |
| Total adjustments                                                                                                                                                                                       |           |            |   |   |   |   |   |   | 355 | 557 | 908 |
| Net cash flows provided by operating activities                                                                                                                                                         |           |            |   |   |   |   |   |   | 1,254 | 1,416 | 1,387 |
| **Cash Flows from Investing Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Change in short term investments                                                                                                                                                                        |           |            |   |   |   |   |   |   | (6) | 258 | 34 |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 20 | 2 | 21 |
| Net cash flows used by investing activities                                                                                                                                                             |           |            |   |   |   |   |   |   | (424) | (846) | (372) |
| **Cash Flows from Financing Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Dividends paid to common stockholders                                                                                                                                                                   |           |            |   |   |   |   |   |   | (842) | (813) | (811) |
| Proceeds from the issuance of debt                                                                                                                                                                      |           |            |   |   |   |   |   |   | 496 | 498 | 0 |
| Repayment of debt                                                                                                                                                                                       |           |            |   |   |   |   |   |   | (391) | (358) | 0 |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | (18) | 0 | 4 |
| Net cash flows used by financing activities                                                                                                                                                             |           |            |   |   |   |   |   |   | (755) | (673) | (807) |
| Net change in cash                                                                                                                                                                                      |           |            |   |   |   |   |   |   | 84 | (116) | 197 |
| Cash, beginning of year                                                                                                                                                                                 |           |            |   | 271 |   |   |   | 387 | 271 | 387 | 190 |
| Cash, end of year                                                                                                                                                                                       | 355            |            |   |   | 271 |   |   |   | 355 | 271 | 387 |
| Parent Company                                                                                                                                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| **Cash Flows from Operating Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Net income                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 899 | 859 | 479 |
| **Adjustments to reconcile net income to net cash flows provided by operating activities:**                                                                                                             |           |            |   |   |   |   |   |   |   |   |   |
| Equity in net income of subsidiaries                                                                                                                                                                    |           |            |   |   |   |   |   |   | (1,032) | (978) | (594) |
| Dividends received from subsidiaries                                                                                                                                                                    |           |            |   |   |   |   |   |   | 955 | 765 | 900 |
| Net realized investment losses (gains)                                                                                                                                                                  |           |            |   |   |   |   |   |   | 42 | 7 | (5) |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 36 | 21 | 4 |
| Total adjustments                                                                                                                                                                                       |           |            |   |   |   |   |   |   | 1 | (185) | 305 |
| Net cash flows provided by operating activities                                                                                                                                                         |           |            |   |   |   |   |   |   | 900 | 674 | 784 |
| **Cash Flows from Investing Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Change in short term investments                                                                                                                                                                        |           |            |   |   |   |   |   |   | (146) | (9) | 21 |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 0 | 4 | 7 |
| Net cash flows used by investing activities                                                                                                                                                             |           |            |   |   |   |   |   |   | (146) | (5) | 28 |
| **Cash Flows from Financing Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Dividends paid to common stockholders                                                                                                                                                                   |           |            |   |   |   |   |   |   | (842) | (813) | (811) |
| Proceeds from the issuance of debt                                                                                                                                                                      |           |            |   |   |   |   |   |   | 496 | 498 | 0 |
| Repayment of debt                                                                                                                                                                                       |           |            |   |   |   |   |   |   | (391) | (358) | 0 |
| Stock options exercised                                                                                                                                                                                 |           |            |   |   |   |   |   |   | 0 | 0 | 1 |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | (17) | 1 | 1 |
| Net cash flows used by financing activities                                                                                                                                                             |           |            |   |   |   |   |   |   | (754) | (672) | (809) |
| Net change in cash                                                                                                                                                                                      |           |            |   |   |   |   |   |   | 0 | (3) | 3 |
| Cash, beginning of year                                                                                                                                                                                 |           |            |   | $ 1 |   |   |   | $ 4 | 1 | 4 | 1 |
| Cash, end of year                                                                                                                                                                                       | $ 1            |            |   |   | $ 1 |   |   |   | $ 1 | $ 1 | $ 4 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net amount paid (received) by the reporting entity through acquisition (sale/maturities) of short-term investments with an original maturity that is less than 12 months which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle.
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| - Definition
The aggregate amount of adjustments to net income or loss necessary to remove the effects of all items whose cash effects are investing or financing cash flows. The aggregate amount also includes all noncash expenses and income items which reduce or increase net income and are thus added back or deducted when calculating cash provided by or used in operating activities.
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| - Definition
The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method.
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| - Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.
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| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.
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| - Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.
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| - Definition
This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.
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| - Definition
Amount after tax of income (loss) of subsidiary attributable to the parent entity.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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| - Definition
Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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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
Amount of cash (inflow) outflow from investing activities classified as other.
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| - Definition
Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.
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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.
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Amount of cash inflow (outflow) from financing activities classified as other.
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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.
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| - Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.
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