| **Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Millions** | 12 Months Ended |
|------------------------------------------------------------------------------------|-----------------|
||
| Net income                                                                         | $ 894           | $ 1,202 | $ 690 |
| **Other Comprehensive (Loss) Income, net of tax**                                  |            |   |   |
| Net unrealized gains and losses on investments                                     | (3,782)         | (708) | 720 |
| Foreign currency translation adjustment                                            | (108)           | (19) | 47 |
| Pension and postretirement benefits                                                | 13              | 244 | (15) |
| Other comprehensive (loss) income, net of tax                                      | (3,877)         | (483) | 752 |
| Total comprehensive (loss) income                                                  | (2,983)         | 719 | 1,442 |
| Investments                                                                        |            |   |   |
| **Other Comprehensive (Loss) Income, net of tax**                                  |            |   |   |
| Net unrealized gains and losses on investments                                     | (5)             | (2) | 0 |
| Net unrealized gains and losses on other investments                               |            |   |   |
| **Other Comprehensive (Loss) Income, net of tax**                                  |            |   |   |
| Net unrealized gains and losses on investments                                     | $ (3,777)       | $ (706) | $ 720 |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Amount, after tax and before adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.
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| - Definition
Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.
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