Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gross Unrealized	$ (402)	$ 13
Income Taxes	97	(3)
Accumulated other comprehensive (loss) income	(305)	10
Unrealized (losses) gains on securities available for sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gross Unrealized	(431)	(12)
Income Taxes	104	3
Accumulated other comprehensive (loss) income	(327)	(9)
Unrealized (losses) gains on securities available for sale transferred to held to maturity
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gross Unrealized	(8)	(9)
Income Taxes	2	2
Accumulated other comprehensive (loss) income	(6)	(7)
Defined benefit pension items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gross Unrealized	37	34
Income Taxes	(9)	(8)
Accumulated other comprehensive (loss) income	28	26
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gross Unrealized	0	0
Income Taxes	0	0
Accumulated other comprehensive (loss) income	0	0
Gains (losses) on hedge derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gross Unrealized	0	0
Income Taxes	0	0
Accumulated other comprehensive (loss) income	$ 0	$ 0