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Accumulated Other Comprehensive Loss (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (2,115) | $ (3,921) | $ (1,915) | $ (3,734)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation | (242) | (176) |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax | (11) | (10) |  |
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging Gains (Losses) | 31 | (46) |  |
Other comprehensive (loss) income before reclassifications, net | (222) | (232) |  |
Amounts reclassified, pretax - Foreign Currency Translation | 2 | 0 |  |
Amounts reclassified, pretax - Pension | 32 | 64 |  |
Amounts reclassified, pretax - Unrealized Hedging Gains (Losses) | 6 | (14) |  |
Amounts reclassified, pre-tax | 40 | 50 |  |
Tax benefit (expense) - Foreign Currency Translation | (3) | (5) |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | (4) | (12) |  |
Tax benefit (expense) - Unrealized Hedging Gains (Losses) | (11) | 12 |  |
Income tax expense related to items of other comprehensive income (loss) | (18) | (5) |  |
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (194) | 529 | 49 | 710
Defined Benefit Pension and Post-retirement Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (1,811) | (4,441) | (1,828) | (4,483)
Unrealized hedging (losses) gains |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (110) | $ (9) | $ (136) | $ 39

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