Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 639	$ 752	$ 2,077	$ 10,952
Other comprehensive income (loss), net of tax
Net unrealized gain (loss) on securities available for sale	438	(108)	325	(150)
Net change in unrealized loss on securities available for sale transferred to securities held to maturity	1	0	1	1
Net change in defined benefit pension items	0	0	(8)	4
Net unrealized gain on cash flow hedge derivatives	12	0	14	0
Other comprehensive income (loss), net of tax	451	(108)	332	(145)
Total comprehensive income	$ 1,090	$ 644	$ 2,409	$ 10,807