Financial Instruments - Gross Notional Amounts of Outstanding Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Foreign exchange contracts \| Derivatives designated as hedging instruments: \| Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 17,726	$ 18,039
Foreign exchange contracts \| Derivatives designated as hedging instruments: \| Fair value hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	1,847	2,065
Foreign exchange contracts \| Derivatives designated as hedging instruments: \| Net investment hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	9,321	9,472
Foreign exchange contracts \| Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	107,978	39,722
Other contracts \| Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 10,902	$ 10,818