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Accumulated Other Comprehensive Loss (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (3,921) | $ (11,788) | $ (3,734) | $ (10,149)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation | (176) | (1,445) |  |
Amounts reclassified, pretax - Foreign Currency Translation | 0 | 0 |  |
Tax benefit (expense) - Foreign Currency Translation | (5) | 9 |  |
Other comprehensive (loss) income before reclassifications, net - Pension | (10) | 8 |  |
Amounts reclassified, pretax - Pension | 64 | 102 |  |
Tax benefit (expense) - Pension | (12) | (31) |  |
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains | (46) | (403) |  |
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains | (14) | 29 |  |
Tax benefit (expense) - Unrealized Hedging (Losses) Gains | 12 | 92 |  |
Other comprehensive (loss) income before reclassifications, net | (232) | (1,840) |  |
Amounts reclassified, pre-tax | 50 | 131 |  |
Tax benefit (expense) | (5) | 70 |  |
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 529 | (4,647) | 710 | (3,211)
Defined Benefit Pension and Post-retirement Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (4,441) | (6,693) | (4,483) | (6,772)
Unrealized hedging (losses) gains |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (9) | $ (448) | $ 39 | $ (166)

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