CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 53	$ 93
Securities available for sale:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $(36) and $(6)	(128)	(21)
Derivative instruments:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $(4) and $1	(15)	4
Reclassification adjustment for gains included in net income, net of tax expense of $0 and $1	2	4
Pension and postretirement benefit obligations:
Unrealized gains arising during the period, net of tax expense of $0 and $0	1	1
Other Comprehensive Income (Loss)	(140)	(12)
Comprehensive Income (Loss)	$ (87)	$ 81