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Other Comprehensive Income (Loss) - Changes in AOCI Balance by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Income Before Reclassifications |  |  |  |  |  |  |  |  |  | $ 22
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  |  | 14
Tax Expense |  |  |  |  |  |  |  |  |  | (20)
Total Other Comprehensive Income | $ 18 | $ (4) | $ 2 |  | $ 18 | $ 39 |  | $ 31 |  | 16
Pension and Other Post-Employment Benefits |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance December 31, 2022, Net of Tax |  |  | (497) |  |  |  |  |  |  | (497)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Income Before Reclassifications |  |  |  |  |  |  |  |  |  | 0
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  |  | 15
Tax Expense |  |  |  |  |  |  |  |  |  | (3)
Total Other Comprehensive Income |  |  |  |  |  |  |  |  |  | 12
Balance September 30, 2023, Net of Tax | (485) |  |  |  |  |  |  |  |  | (485)
Interest Rate Derivatives |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance December 31, 2022, Net of Tax |  |  | 150 |  |  |  |  |  |  | 150
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Income Before Reclassifications |  |  |  |  |  |  |  |  |  | 22
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  |  | 0
Tax Expense |  |  |  |  |  |  |  |  |  | (18)
Total Other Comprehensive Income |  |  |  |  |  |  |  |  |  | 4
Balance September 30, 2023, Net of Tax | 154 |  |  |  |  |  |  |  |  | 154
Other |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance December 31, 2022, Net of Tax |  |  | (41) |  |  |  |  |  |  | (41)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Income Before Reclassifications |  |  |  |  |  |  |  |  |  | 0
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  |  | (1)
Tax Expense |  |  |  |  |  |  |  |  |  | 1
Total Other Comprehensive Income |  |  |  |  |  |  |  |  |  | 0
Balance September 30, 2023, Net of Tax | (41) |  |  |  |  |  |  |  |  | (41)
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance December 31, 2022, Net of Tax |  |  | (388) |  |  |  |  |  |  | (388)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |
Total Other Comprehensive Income | 18 | $ (4) | $ 2 | [1] | $ 18 | $ 39 | [1] | $ 31 | [1] |
Balance September 30, 2023, Net of Tax | $ (372) |  |  |  |  |  |  |  |  | $ (372)
[1] | Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $107 million as of December 31, 2021, $99 million as of March 31, 2022, $88 million as of June 30, 2022, and $85 million as of September 30, 2022. For additional information, see Note 10, Other Comprehensive Income.

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