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Other Comprehensive Earnings/Losses (Reclassifications) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net periodic benefit (income) cost, excluding service cost | $ (43) | $ (27)
(Income) losses from equity investments | (251) | (157)
Pre-tax amounts reclassified from accumulated other comprehensive losses to net earnings | (1,421) | (1,550)
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Pre-tax amounts reclassified from accumulated other comprehensive losses to net earnings | 10 | 21
Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net periodic benefit (income) cost, excluding service cost | 38 | 28
Net loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net periodic benefit (income) cost, excluding service cost | 43 | 34
Prior service cost/credit [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net periodic benefit (income) cost, excluding service cost | (5) | (6)
ABI [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
(Income) losses from equity investments | $ (28) | $ (7)

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