| **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                                                                                                                                                                                              | $ 273          | $ 107           | $ 278 | $ 342 | $ (84) | $ 336 | $ 270 | $ 291 | $ 1,000 | $ 813 | $ 899 |
| **Adjustments to reconcile net income to net cash flows provided by operating activities:**                                                                                                             |           |            |   |   |   |   |   |   |   |   |   |
| Net investment losses                                                                                                                                                                                   |           |            |   |   |   |   |   |   | (29) | 52 | (93) |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | (225) | (223) | 53 |
| Net cash flows provided by operating activities                                                                                                                                                         |           |            |   |   |   |   |   |   | 1,140 | 1,227 | 1,254 |
| **Cash Flows from Investing Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Change in short term investments                                                                                                                                                                        |           |            |   |   |   |   |   |   | (535) | 168 | (6) |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 15 | 18 | 20 |
| Net cash flows used by investing activities                                                                                                                                                             |           |            |   |   |   |   |   |   | (225) | (177) | (424) |
| **Cash Flows from Financing Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Dividends paid to common stockholders                                                                                                                                                                   |           |            |   |   |   |   |   |   | (929) | (896) | (842) |
| Proceeds from the issuance of debt                                                                                                                                                                      |           |            |   |   |   |   |   |   | 496 | 0 | 496 |
| Repayment of debt                                                                                                                                                                                       |           |            |   |   |   |   |   |   | (520) | (180) | (391) |
| Purchase of treasury stock                                                                                                                                                                              |           |            |   |   |   |   |   |   | (23) | 0 | 0 |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | (12) | (9) | (18) |
| Net cash flows used by financing activities                                                                                                                                                             |           |            |   |   |   |   |   |   | (988) | (1,085) | (755) |
| Cash, beginning of year                                                                                                                                                                                 |           |            |   | 310 |   |   |   |   | 310 |   |   |
| Cash, end of year                                                                                                                                                                                       | 242            |            |   |   | 310 |   |   |   | 242 | 310 |   |
| Parent Company                                                                                                                                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| **Cash Flows from Operating Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Net income                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 1,000 | 813 | 899 |
| **Adjustments to reconcile net income to net cash flows provided by operating activities:**                                                                                                             |           |            |   |   |   |   |   |   |   |   |   |
| Equity in net income of subsidiaries                                                                                                                                                                    |           |            |   |   |   |   |   |   | (1,119) | (930) | (1,032) |
| Dividends received from subsidiaries                                                                                                                                                                    |           |            |   |   |   |   |   |   | 1,065 | 1,026 | 955 |
| Net investment losses                                                                                                                                                                                   |           |            |   |   |   |   |   |   | 21 | 0 | 42 |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 13 | 16 | 36 |
| Net cash flows provided by operating activities                                                                                                                                                         |           |            |   |   |   |   |   |   | 980 | 925 | 900 |
| **Cash Flows from Investing Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Change in short term investments                                                                                                                                                                        |           |            |   |   |   |   |   |   | 10 | 130 | (146) |
| Capital contributions to subsidiaries                                                                                                                                                                   |           |            |   |   |   |   |   |   | (2) | (2) | 0 |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 0 | 0 | 0 |
| Net cash flows used by investing activities                                                                                                                                                             |           |            |   |   |   |   |   |   | 8 | 128 | (146) |
| **Cash Flows from Financing Activities**                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| Dividends paid to common stockholders                                                                                                                                                                   |           |            |   |   |   |   |   |   | (929) | (896) | (842) |
| Proceeds from the issuance of debt                                                                                                                                                                      |           |            |   |   |   |   |   |   | 496 | 0 | 496 |
| Repayment of debt                                                                                                                                                                                       |           |            |   |   |   |   |   |   | (520) | (150) | (391) |
| Purchase of treasury stock                                                                                                                                                                              |           |            |   |   |   |   |   |   | (23) | 0 | 0 |
| Other, net                                                                                                                                                                                              |           |            |   |   |   |   |   |   | (12) | (7) | (17) |
| Net cash flows used by financing activities                                                                                                                                                             |           |            |   |   |   |   |   |   | (988) | (1,053) | (754) |
| Net change in cash                                                                                                                                                                                      |           |            |   |   |   |   |   |   | 0 | 0 | 0 |
| Cash, beginning of year                                                                                                                                                                                 |           |            |   | $ 1 |   |   |   | $ 1 | 1 | 1 | 1 |
| Cash, end of year                                                                                                                                                                                       | $ 1            |            |   |   | $ 1 |   |   |   | $ 1 | $ 1 | $ 1 |

| X                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Capital Contributions to Subsidiaries
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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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Investments and Derivatives, Realized Gain (Loss)
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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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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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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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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example,  cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).
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Amount of cash (inflow) outflow from investing activities classified as other.
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The cash outflow to reacquire common stock during the period.
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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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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.
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