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v3.23.3

Accumulated Other Comprehensive Income (Loss), Net of Tax (Changes of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ (515) | $ (455) | $ (550) | $ (350) | $ (350)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 59 | (48) | 77 | (166) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 243 | 10 | 260 | 23 |
Other Comprehensive Income (Loss), net of tax | 302 | (38) | 337 | (143) |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (213) | (493) | (213) | (493) | (550)
Cash Flow Hedges [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 7 | (5) | (3) | (6) | (6)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 13 | 0 | 23 | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | 1 | (2) | 2 | 3
Other Comprehensive Income (Loss), net of tax | 11 | 1 | 21 | 2 |
Accumulated Other Comprehensive Income (Loss), Ending Balance | 18 | (4) | 18 | (4) | (3)
Pension and OPEB Plans [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (419) | (354) | (426) | (355) | (355)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 82 | 0 | 82 | 0 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 240 | 0 | 247 | 1 |
Other Comprehensive Income (Loss), net of tax | 322 | 0 | 329 | 1 |
Accumulated Other Comprehensive Income (Loss), Ending Balance | (97) | (354) | (97) | (354) | (426)
Available-for-Sale Securities [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (103) | (96) | (121) | 11 | 11
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (36) | (48) | (28) | (166) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 5 | 9 | 15 | 20 |
Other Comprehensive Income (Loss), net of tax | (31) | (39) | (13) | (146) |
Accumulated Other Comprehensive Income (Loss), Ending Balance | $ (134) | $ (135) | $ (134) | $ (135) | $ (121)

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