Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 271	$ 147
Other comprehensive income (loss), net of tax
Net unrealized losses on securities available for sale	(317)	(51)
Net change in pension obligations	2	5
Other comprehensive loss, net of tax	(315)	(46)
Total comprehensive (loss) income	$ (44)	$ 101