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Accumulated Other Comprehensive Income (Loss), Net of Tax (Changes of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ (169) | $ (522) | $ (179) | $ (550) | $ (550)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (5) | 0 | 3 | 18 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 1 | 7 | 3 | 17 |
Other Comprehensive Income (Loss), net of tax | (4) | 7 | 6 | 35 |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (173) | (515) | (173) | (515) | (179)
Cash Flow Hedges [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 21 | (4) | 3 | (3) | (3)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 2 | 12 | 22 | 10 | 9
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | (1) | (5) | 0 | (3)
Other Comprehensive Income (Loss), net of tax | (1) | 11 | 17 | 10 |
Accumulated Other Comprehensive Income (Loss), Ending Balance | 20 | 7 | 20 | 7 | 3
Pension and OPEB Plans [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (100) | (423) | (102) | (426) | (426)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0 | 0 | 0 | 0 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 2 | 4 | 4 | 7 |
Other Comprehensive Income (Loss), net of tax | 2 | 4 | 4 | 7 |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (98) | (419) | (98) | (419) | (102)
Available-for-Sale Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (90) | (95) | (80) | (121) | (121)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (7) | (12) | (19) | 8 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 2 | 4 | 4 | 10 |
Other Comprehensive Income (Loss), net of tax | (5) | (8) | (15) | 18 |
Accumulated Other Comprehensive Income (Loss), Ending Balance | $ (95) | $ (103) | $ (95) | $ (103) | $ (80)

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