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EATON SHAREHOLDERS' EQUITY - Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pre-tax |  |  |
Other comprehensive income (loss) attributable to Eaton ordinary shareholders | $ 735 | $ 55 | $ (187)
After-tax |  |  |
Amounts reclassified from Accumulated other comprehensive loss (income) | 507 |  |
Other comprehensive income (loss) attributable to Eaton ordinary shareholders | 562 | 95 | (145)
Currency translation and related hedging instruments |  |  |
Pre-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, pre-tax | (335) | 154 | 15
Reclassification from AOCI, pre-tax | 369 | 37 | 0
Other comprehensive income (loss) attributable to Eaton ordinary shareholders | 34 | 191 | 15
After-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, after-tax | (339) | 164 | 16
Amounts reclassified from Accumulated other comprehensive loss (income) | 369 | 37 | 0
Other comprehensive income (loss) attributable to Eaton ordinary shareholders | 30 | 201 | 16
Pensions and other postretirement benefits |  |  |
Pre-tax |  |  |
Reclassification from AOCI, pre-tax | 183 | 221 | 148
Other comprehensive income (loss) attributable to Eaton ordinary shareholders | 654 | (93) | (164)
After-tax |  |  |
Amounts reclassified from Accumulated other comprehensive loss (income) | 140 | 169 | 117
Other comprehensive income (loss) attributable to Eaton ordinary shareholders | 495 | (73) | (130)
Prior service credit (cost) arising during the year |  |  |
Pre-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, pre-tax | (1) | (1) | (2)
After-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, after-tax | (1) | (1) | (2)
Net gain (loss) arising during the year |  |  |
Pre-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, pre-tax | 448 | (263) | (294)
After-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, after-tax | 337 | (203) | (232)
Currency translation |  |  |
Pre-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, pre-tax | 24 | (48) | (16)
After-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, after-tax | 19 | (37) | (13)
Other |  |  |
Pre-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, pre-tax | 0 | (2) | 0
After-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, after-tax | 0 | (1) | 0
Cash flow hedges |  |  |
Pre-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, pre-tax | 50 | (60) | (33)
Reclassification from AOCI, pre-tax | (3) | 17 | (5)
Other comprehensive income (loss) attributable to Eaton ordinary shareholders | 47 | (43) | (38)
After-tax |  |  |
Other comprehensive income (loss) arising during the year, before reclassifications, after-tax | 39 | (47) | (27)
Amounts reclassified from Accumulated other comprehensive loss (income) | (2) | 14 | (4)
Other comprehensive income (loss) attributable to Eaton ordinary shareholders | $ 37 | $ (33) | $ (31)

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