CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 138	$ 111	$ 300	$ 306
Securities available for sale:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $(33), $(3), $(84) and $(8)	(116)	(10)	(294)	(29)
Derivative instruments:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $(4), $0, $(9) and $1	(13)	(1)	(30)	3
Reclassification adjustment for gains included in net income, net of tax expense of $1, $1, $2 and $3	2	4	6	11
Pension and postretirement benefit obligations:
Unrealized gains (losses) arising during the period, net of tax expense of $0, $1, $0 and $1	1	1	2	2
Other Comprehensive Income (Loss)	(126)	(6)	(316)	(13)
Comprehensive Income (Loss)	$ 12	$ 105	$ (16)	$ 293