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Other Comprehensive Income (Loss) - Schedule of Changes in AOCI balance by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | [2] | Mar. 31, 2023 | [2] | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Income Before Reclassifications |  |  |  |  |  |  |  |  | $ 4 |  |
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  | 8 |  |
Tax Expense |  |  |  |  |  |  |  |  | (3) |  |
Total Other Comprehensive Income | $ 3 | [1] | $ 6 | [1] | $ (4) |  | $ 2 |  | 9 | $ 131 | $ (34)
Pension and Other Post-Employment Benefits |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance December 31, 2023, Net of Tax |  |  | (390) |  |  |  |  |  | (390) |  |
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Income Before Reclassifications |  |  |  |  |  |  |  |  | 0 |  |
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  | 6 |  |
Tax Expense |  |  |  |  |  |  |  |  | (2) |  |
Total Other Comprehensive Income |  |  |  |  |  |  |  |  | 4 |  |
Balance June 30, 2024, Net of Tax | (386) |  |  |  |  |  |  |  | (386) | (390) |
Interest Rate Derivatives |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance December 31, 2023, Net of Tax |  |  | 150 |  |  |  |  |  | 150 |  |
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Income Before Reclassifications |  |  |  |  |  |  |  |  | 4 |  |
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  | 0 |  |
Tax Expense |  |  |  |  |  |  |  |  | (1) |  |
Total Other Comprehensive Income |  |  |  |  |  |  |  |  | 3 |  |
Balance June 30, 2024, Net of Tax | 153 |  |  |  |  |  |  |  | 153 | 150 |
Other |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance December 31, 2023, Net of Tax |  |  | (39) |  |  |  |  |  | (39) |  |
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Income Before Reclassifications |  |  |  |  |  |  |  |  | 0 |  |
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  | 2 |  |
Tax Expense |  |  |  |  |  |  |  |  | 0 |  |
Total Other Comprehensive Income |  |  |  |  |  |  |  |  | 2 |  |
Balance June 30, 2024, Net of Tax | (37) |  |  |  |  |  |  |  | (37) | (39) |
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance December 31, 2023, Net of Tax |  |  | (279) |  |  |  |  |  | (279) |  |
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Total Other Comprehensive Income | 3 | [1],[3] | $ 6 | [1],[3] | $ (4) | [4] | $ 2 | [4] |  | 131 | $ (34)
Balance June 30, 2024, Net of Tax | $ (270) |  |  |  |  |  |  |  | $ (270) | $ (279) |
[1] | See Note 11, Revision of Prior Period Financial Statements.
[2] | See Note 11, Revision of Prior Period Financial Statements.
[3] | Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $74 million as of December 31, 2023, $72 million as of March 31, 2024 and $72 million as of June 30, 2024. For additional information, see Note 10, Other Comprehensive Income.
[4] | Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $129 million as of December 31, 2022, $128 million as of March 31, 2023 and $114 million as of June 30, 2023. For additional information, see Note 10, Other Comprehensive Income.

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