Fair Value - Changes in FV under the FV Option (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value (gains) losses, net	$ (211)	$ (447)	$ (334)	$ (927)
Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value (gains) losses, net	(36)	2	(161)	47
Long-term Debt
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value (gains) losses, net	$ 68	$ (17)	$ 379	$ (128)