Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 752	$ 315	$ 10,952	$ 841
Other comprehensive loss, net of tax
Net unrealized loss on securities available for sale	(108)	(266)	(150)	(747)
Net change in unrealized loss on securities available for sale transferred to securities held to maturity	0	0	1	1
Net change in defined benefit pension items	0	2	4	7
Other comprehensive loss, net of tax	(108)	(264)	(145)	(739)
Total comprehensive income	$ 644	$ 51	$ 10,807	$ 102