CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - 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	$ 109	$ 102	$ 162	$ 195
Securities available for sale:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $(15), $1, $(51) and $(5)	(50)	2	(178)	(19)
Derivative instruments:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $(1), $0, $(5) and $1	(2)	0	(17)	4
Reclassification adjustment for gains included in net income, net of tax expense of $1, $1, $1 and $2	2	3	4	7
Pension and postretirement benefit obligations:
Unrealized gains arising during the period, net of tax expense of $0, $0, $0 and $0	0	0	1	1
Other Comprehensive Income (Loss)	(50)	5	(190)	(7)
Comprehensive Income (Loss)	$ 59	$ 107	$ (28)	$ 188