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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | $ 14,306 | $ 12,781
Net Income | 0 | (6)
Reclassification Adjustments | 0 | (6)
Ending balance | 15,141 | 13,785
Accum. Other Comprehensive Loss |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (262) | (320)
Ending balance | (262) | (332)
Pensions and other postretirement liabilities |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (240) | (292)
Net Income | 0 | (7)
Reclassification Adjustments | 0 | (6)
Ending balance | (240) | (305)
Other comprehensive income (loss) of equity investees |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |
Beginning balance | (22) | (28)
Net Income | 0 | 1
Reclassification Adjustments | 0 | 0
Ending balance | $ (22) | $ (27)

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