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v3.25.3

Accumulated Other Comprehensive Income (Loss) - After-tax Changes by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance at beginning of period | $ (190) | $ (160) | $ (184) | $ (163)
Amounts arising during the period | (3) | (4) | (10) | (1)
Reclassifications from AOCI | 0 | 1 | 1 | 1
Net OCI during the period | (3) | (3) | (9) | 0
Balance at end of period | (193) | (163) | (193) | (163)
Other Comprehensive Income (Loss), Equity Investees' AOCI, reclassification, After Tax | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Equity Investees' AOCI, before Reclassifications, Net of Tax | 0 | 0 | 0 | 1
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance at beginning of period | (3) | (4) | (3) | (4)
Net OCI during the period | 0 | 0 | 0 | 0
Balance at end of period | (3) | (4) | (3) | (4)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance at beginning of period | (202) | (167) | (194) | (168)
Net OCI during the period | (4) | (5) | (12) | (4)
Balance at end of period | (206) | (172) | (206) | (172)
Equity Investees' OCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance at beginning of period | 4 | 4 | 4 | 3
Net OCI during the period | 0 | 0 | 0 | 1
Balance at end of period | 4 | 4 | 4 | 4
Unrealized gains (losses) on qualifying derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Balance at beginning of period | 11 | 7 | 9 | 6
Net OCI during the period | 1 | 2 | 3 | 3
Balance at end of period | $ 12 | $ 9 | $ 12 | $ 9

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