CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 494	$ 382	$ 1,303	$ 1,108
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) arising during the period	(16)	450	275	(84)
Reclassification of net (gains) losses to earnings	144	203	437	522
Net unrealized gains (losses) on AFS securities arising during the period	223	541	561	339
Reclassification of net (gains) losses to earnings	18	13	48	42
Defined benefit plans:
Net actuarial gain (loss) arising during the period	0	0	0	4
Amortization of actuarial (gain) loss to earnings	3	2	7	9
Total other comprehensive income (loss), net	372	1,209	1,328	832
Total comprehensive income (loss)	$ 866	$ 1,591	$ 2,631	$ 1,940