Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 255	$ 153	$ 526	$ 300
Other comprehensive income (loss), net of tax
Net unrealized loss (gain) on securities available for sale	(163)	7	(481)	(44)
Net change in unrealized loss on securities available for sale transferred to securities held to maturity	0	0	1	0
Net change in pension obligations	3	5	5	10
Other comprehensive (loss) income, net of tax	(160)	12	(475)	(34)
Total comprehensive income	$ 95	$ 165	$ 51	$ 266