Long-Term Debt - Long-term debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument
Fair value adjustments	$ 54	$ (16)
Long-term debt	27,103	25,406
Medium-term notes
Debt Instrument
Long term debt, gross	26,424	24,940
Unamortized discount and debt issuance costs	(41)	(42)
Fair value adjustments	54	(16)
Long-term debt	$ 26,437	$ 24,882
Weighted Avg. Rate	3.80%	3.90%
Bank borrowings and other
Debt Instrument
Long-term debt	$ 666
Weighted Avg. Rate	10.70%	9.60%