Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1,098	$ 547	$ 492
Other comprehensive (loss) income, net of tax
Net unrealized (loss) gain on securities available for sale	(730)	(88)	73
Net change in unrealized loss on securities available for sale transferred to securities held to maturity	1	(11)	4
Net change in defined benefit pension items	(16)	97	62
Other comprehensive (loss) income, net of tax	(745)	(2)	139
Total comprehensive income	$ 353	$ 545	$ 631