Financial Instruments - Gross Notional Amounts of Outstanding Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Foreign exchange derivatives \| Derivatives designated as hedging instruments: \| Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 23,448	$ 23,852
Foreign exchange derivatives \| Derivatives designated as hedging instruments: \| Net investment hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	14,020	14,203
Foreign exchange derivatives \| Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	51,976	56,085
Equity derivatives \| Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	30,000	0
Credit derivatives \| Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	28,436	16,940
Other derivatives \| Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 15,862	$ 15,900