Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 9,518	$ 271
Other comprehensive income (loss), net of tax
Net unrealized gain (loss) on securities available for sale	58	(318)
Net change in unrealized loss on securities available for sale transferred to securities held to maturity	0	1
Net change in defined benefit pension items	8	2
Other comprehensive income (loss), net of tax	66	(315)
Total comprehensive income (loss)	$ 9,584	$ (44)