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Other (Income) Expense, Net (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other Income and Expenses [Abstract]    
Interest income $ (11) $ (25)
Interest expense 200 212
Exchange losses 47 54
Income from investments in equity securities, net (574) (52)
Net periodic defined benefit plan (credit) cost other than service cost (89) (90)
Other, net (21) (28)
Other (income) expense, net $ (448) $ 71