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 attributable to Huntington	$ 523	$ 527
Other comprehensive (loss) income, net of tax:
Unrealized (losses) gains on available-for-sale securities, net of hedges	(76)	255
Net change related to cash flow hedges on loans	(76)	177
Translation adjustments, net of hedges	0	1
Change in accumulated unrealized losses for pension and other post-retirement obligations	1	0
Other comprehensive (loss) income, net of tax	(151)	433
Comprehensive income attributable to Huntington	372	960
Comprehensive income attributed to non-controlling interest	4	4
Comprehensive income	$ 376	$ 964