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FAIR VALUE - Fair Value of Swap Agreements (Details) - USD ($) | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Interest Rate Swap Maturing 2033 | Securities lending invested collateral |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative, notional amount | $ 650,000,000 |  | $ 650,000,000
Interest Rate Swap Maturing 2053 | Securities lending invested collateral |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative, notional amount | 700,000,000 |  | 300,000,000
Interest Rate Swap Maturing 2049 | Securities lending invested collateral |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative, notional amount | 450,000,000 |  | 450,000,000
Interest Rate Swap Maturing 2034 | Securities lending invested collateral |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative, notional amount | 800,000,000 |  | 400,000,000
Interest Rate Swap Maturing 2054 | Securities lending invested collateral |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative, notional amount | 400,000,000 |  | $ 0
$750 million, 5.875% due March 1, 2033 | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Aggregate principal | $ 750,000,000 |  |
Stated interest rate (percent) | 5.875% |  |
$750 million, 5.500% due March 15, 2053 | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Aggregate principal | $ 750,000,000 |  |
Stated interest rate (percent) | 5.50% |  |
$500 million, 3.950% due August 15, 2049 | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Aggregate principal | $ 500,000,000 |  |
Stated interest rate (percent) | 3.95% |  |
$850 million, 5.950% due March 15, 2034 | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Aggregate principal | $ 850,000,000 |  |
Stated interest rate (percent) | 5.95% |  |
$1,000 million, $5.750% due April 15, 2054 | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Aggregate principal | $ 1,000,000,000 | $ 1,000,000,000 |
Stated interest rate (percent) | 5.75% | 5.75% |

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