| **Future Policy Benefit Reserves - Summary of Balances and Changes (Details) - USD ($) $ in Millions**                                                                                                                                                                                                                                                              | 9 Months Ended |          |          |     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------|----------|-----|
||
| **Present value of future net premiums**                                                                                                                                                                                                                                                                                                                            |           |     |     |     |   |   |
| Balance, January 1                                                                                                                                                                                                                                                                                                                                                  | $ 3,993        | $ 4,735  |     |     |   |   |
| Effect of changes in discount rate                                                                                                                                                                                                                                                                                                                                  | 67             | (40)     | $ (74)   |     | $ (880) |   |
| Balance, January 1, at original locked in discount rate                                                                                                                                                                                                                                                                                                             | 3,919          | 3,855    |     |     |   |   |
| Effect of changes in cash flow assumptions                                                                                                                                                                                                                                                                                                                          |           |     | 28       |     | 352 |   |
| Expect of actual variances from expected experience                                                                                                                                                                                                                                                                                                                 |           |     | (112)    |     | (40) |   |
| Adjusted balance, January 1                                                                                                                                                                                                                                                                                                                                         |           |     | 3,835    |     | 4,167 |   |
| Interest accrual                                                                                                                                                                                                                                                                                                                                                    | 153            | 161      |     |     |   |   |
| Net premiums: earned during period                                                                                                                                                                                                                                                                                                                                  | (332)          | (341)    |     |     |   |   |
| Balance, end of period at original locked in discount rate                                                                                                                                                                                                                                                                                                          | 3,656          | 3,987    |     |     |   |   |
| Effect of changes in discount rate                                                                                                                                                                                                                                                                                                                                  | (67)           | 40       | 74       |     | 880 |   |
| Balance, September 30                                                                                                                                                                                                                                                                                                                                               | 3,589          | 4,027    |     |     |   |   |
| **Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]**                                                                                                                                                                                                                                                                              |           |     |     |     |   |   |
| Balance, January 1                                                                                                                                                                                                                                                                                                                                                  | 17,472         | 22,745   |     |     |   |   |
| Effect of changes in discount rate                                                                                                                                                                                                                                                                                                                                  | 873            | 134      | (125)    |     | (5,942) |   |
| Balance, January 1, at original locked in discount rate                                                                                                                                                                                                                                                                                                             | 17,347         | 16,803   |     |     |   |   |
| Effect of change in cash flow assumptions                                                                                                                                                                                                                                                                                                                           |           |     | 36       |     | 538 |   |
| Effect of actual variances from expected experience                                                                                                                                                                                                                                                                                                                 |           |     | (45)     |     | (21) |   |
| Adjusted balance, January 1                                                                                                                                                                                                                                                                                                                                         |           |     | 17,338   |     | 17,320 |   |
| Interest accrual                                                                                                                                                                                                                                                                                                                                                    | 723            | 730      |     |     |   |   |
| Benefit & expense payments                                                                                                                                                                                                                                                                                                                                      | (945)          | (708)    |     |     |   |   |
| Balance, end of period at original locked in discount rate                                                                                                                                                                                                                                                                                                          | 17,116         | 17,342   |     |     |   |   |
| Effect of changes in discount rate                                                                                                                                                                                                                                                                                                                                  | (873)          | (134)    | 125      |     | $ 5,942 |   |
| Balance, September 30                                                                                                                                                                                                                                                                                                                                               | 16,243         | 17,208   |     |     |   |   |
| Net LFPB, September 30                                                                                                                                                                                                                                                                                                                                              | $ 12,654       | $ 13,181 | $ 13,480 | [1] |   | $ 19,132 |
|                                                                                                                                                                                                                                                                                                                                                                     |
| [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, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate.
+ References
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| - Definition
Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from increase (decrease) in expected net premium component of liability for future policy benefit from change in discount rate.
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| - Definition
Amount, before effect of reinsurance and after current period update of cash flow assumption, of expected future benefit and expense component for liability for future policy benefit, discounted at original rate.
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| - Definition
Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of expected future policy benefit and expense component of liability for future policy benefit.
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| - Definition
Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from cash flow assumption change for future cash flows.
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Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from effect of variance from cash flow assumption change for actual experience.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest expense for expected future policy benefit and expense component of liability for future policy benefit.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before effect of reinsurance and current period update of cash flow assumption, of expected future policy benefit and expense component of liability for future policy benefit, discounted at original rate.
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of expected net premium component of liability for future policy benefit.
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| - Definition
Amount of cumulative increase (decrease) in expected net premium component of liability for future policy benefit from cash flow assumption change for future cash flows.
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| - Definition
Amount of cumulative increase (decrease) in expected net premium component for liability of future policy benefit from effect of variance from cash flow assumption change for actual experience.
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| - Definition
Amount of interest income for expected net premium component of liability for future policy benefit.
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| - Definition
Amount of premium collected from policyholder to fund expected benefit payment for expected net premium component of liability for future policy benefit.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before effect of reinsurance and current period update of cash flow assumption, of expected net premium component of liability for future policy benefit, discounted at original rate.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before effect of reinsurance and after current period update of cash flow assumption, of expected net premium component for liability for future policy benefit, discounted at original rate.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash outflow to policyholder from benefit payment for expected future policy benefit and expense component of liability for future policy benefit.
+ References
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