Financial Instruments - Fair Values of Outstanding Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Derivative Assets:
Assets	$ 1,305	$ 732
Derivative Liabilities:
Liabilities	1,636	379
Derivatives designated as hedging instruments:
Derivative Assets:
Assets	502	316
Derivative Liabilities:
Liabilities	321	197
Derivatives designated as hedging instruments: \| Foreign exchange derivatives
Derivative Assets:
Assets	501	316
Derivative Liabilities:
Liabilities	64	197
Derivatives designated as hedging instruments: \| Interest rate derivatives
Derivative Assets:
Assets	1	0
Derivative Liabilities:
Liabilities	257	0
Derivatives not designated as hedging instruments:
Derivative Assets:
Assets	803	416
Derivative Liabilities:
Liabilities	1,315	182
Derivatives not designated as hedging instruments: \| Foreign exchange derivatives
Derivative Assets:
Assets	117	92
Derivative Liabilities:
Liabilities	240	15
Derivatives not designated as hedging instruments: \| Equity derivatives
Derivative Assets:
Assets	579	0
Derivative Liabilities:
Liabilities	445	0
Derivatives not designated as hedging instruments: \| Credit derivatives
Derivative Assets:
Assets	0	0
Derivative Liabilities:
Liabilities	606	69
Derivatives not designated as hedging instruments: \| Other derivatives
Derivative Assets:
Assets	107	324
Derivative Liabilities:
Liabilities	$ 24	$ 98