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Other Comprehensive Earnings/Losses (Reclassifications) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net periodic benefit income, excluding service cost $ (31) $ (46)
(Income) losses from investments in equity securities (170) (134)
Pre-tax amounts reclassified from accumulated other comprehensive losses to net earnings (1,787) (1,959)
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 (7) (14)
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, excluding service cost (8) 21
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, excluding service cost 1 31
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, excluding service cost (9) (10)
ABI [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
(Income) losses from investments in equity securities $ 1 $ (35)