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Schedule IV - Reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reinsurance Face Amount/Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |
Gross Amount |  | $ 4,173,524 | $ 4,133,602 |  | $ 4,067,801 |
Ceded to Other Companies |  | 891,770 | 858,957 |  | 835,774 |
Assumed from Other Companies |  | 165,988 | 178,286 |  | 177,089 |
Net Amount |  | $ 3,447,742 | $ 3,452,931 |  | $ 3,409,116 |
Percentage of Amount Assumed to Net |  | 4.80% | 5.20% |  | 5.20% |
Gross Amount |  | $ 29,475 | $ 34,721 |  | $ 30,668 |
Ceded to Other Companies |  | 7,116 | 2,318 |  | 2,417 |
Assumed from Other Companies |  | 5,005 | 4,072 |  | 5,699 |
Premiums | [1] | $ 27,364 | $ 36,475 | [2] | $ 33,950 | [2]
Percentage of Amount Assumed to Net |  | 18.30% | 11.20% |  | 16.80% |
Life Insurance |  |  |  |  |  |
Reinsurance Face Amount/Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |
Gross Amount |  | $ 26,585 | $ 31,900 |  | $ 27,690 |
Ceded to Other Companies |  | 7,028 | 2,227 |  | 2,329 |
Assumed from Other Companies |  | 5,005 | 4,072 |  | 5,699 |
Premiums |  | $ 24,562 | $ 33,745 |  | $ 31,060 |
Percentage of Amount Assumed to Net |  | 20.40% | 12.10% |  | 18.30% |
Accident and Health Insurance |  |  |  |  |  |
Reinsurance Face Amount/Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |  |  |  |
Gross Amount |  | $ 2,890 | $ 2,821 |  | $ 2,978 |
Ceded to Other Companies |  | 88 | 91 |  | 88 |
Assumed from Other Companies |  | 0 | 0 |  | 0 |
Premiums |  | $ 2,802 | $ 2,730 |  | $ 2,890 |
Percentage of Amount Assumed to Net |  | 0.00% | 0.00% |  | 0.00% |
[1] | See Note 24 for additional information regarding related party transactions.
[2] | Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.

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