CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 517	$ 373
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) arising during the period	(124)	208
Reclassification of net (gains) losses to earnings	83	148
Net unrealized gains (losses) on AFS securities arising during the period	(100)	282
Reclassification of net (gains) losses to earnings	19	13
Defined benefit plans:
Amortization of actuarial (gain) loss to earnings	4	3
Total other comprehensive income (loss), net	(118)	654
Total comprehensive income (loss)	$ 399	$ 1,027