| **General (Effects of Adoption of ASU 2018-12, Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions**                                                                                                                                                                                                                                                     | 3 Months Ended | 9 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                    |           |           |  |   |   |
| Net unrealized gains and losses on investments                                                                                                                                                                                                                                                                                                                      | $ (1,085)      | $ (1,737)      | [1] | $ (837) | $ (6,612) |
| Impact of changes in discount rates used to measure long-duration contract liabilities                                                                                                                                                                                                                                                                              | 818            | 994            | [1] | 678 | 4,136 |
| Other comprehensive loss                                                                                                                                                                                                                                                                                                                                            | (316)          | (840)          | [1] | (143) | (2,643) |
| Total comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                   | (58)           | (882)          | [1] | 695 | (2,200) |
| Net unrealized gains and losses on other investments                                                                                                                                                                                                                                                                                                                |           |           |  |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                    |           |           |  |   |   |
| Net unrealized gains and losses on investments                                                                                                                                                                                                                                                                                                                      | $ (1,084)      | (1,735)        | [1] | $ (827) | (6,604) |
| Prior to Adoption                                                                                                                                                                                                                                                                                                                                                   |           |           |  |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                    |           |           |  |   |   |
| Net unrealized gains and losses on investments                                                                                                                                                                                                                                                                                                                      |           | (1,329)        |  |   | (4,292) |
| Impact of changes in discount rates used to measure long-duration contract liabilities                                                                                                                                                                                                                                                                              |           | 0              |  |   | 0 |
| Other comprehensive loss                                                                                                                                                                                                                                                                                                                                            |           | (1,426)        |  |   | (4,459) |
| Total comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                   |           | (1,298)        |  |   | (3,813) |
| Prior to Adoption | Net unrealized gains and losses on other investments                                                                                                                                                                                                                                                                                            |           |           |  |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                    |           |           |  |   |   |
| Net unrealized gains and losses on investments                                                                                                                                                                                                                                                                                                                      |           | (1,327)        |  |   | (4,284) |
| Effect of Adoption                                                                                                                                                                                                                                                                                                                                                  |           |           |  |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                    |           |           |  |   |   |
| Net unrealized gains and losses on investments                                                                                                                                                                                                                                                                                                                      |           | (408)          |  |   | (2,320) |
| Impact of changes in discount rates used to measure long-duration contract liabilities                                                                                                                                                                                                                                                                              |           | 994            |  |   | 4,136 |
| Other comprehensive loss                                                                                                                                                                                                                                                                                                                                            |           | 586            |  |   | 1,816 |
| Total comprehensive income (loss)                                                                                                                                                                                                                                                                                                                                   |           | 416            |  |   | 1,613 |
| Effect of Adoption | Net unrealized gains and losses on other investments                                                                                                                                                                                                                                                                                           |           |           |  |   |   |
| **New Accounting Pronouncements or Change in Accounting Principle [Line Items]**                                                                                                                                                                                                                                                                                    |           |           |  |   |   |
| Net unrealized gains and losses on investments                                                                                                                                                                                                                                                                                                                      |           | $ (408)        |  |   | $ (2,320) |
|                                                                                                                                                                                                                                                                                                                                                                     |
| [1]As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021.  Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance.  See Note A to the Condensed Consolidated Financial Statements for additional information. |

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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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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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