Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statements of Comprehensive Income/(loss)
Net income	$ 916	$ 912	$ 1,010
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on securities available for sale	137	(937)	(144)
Net unrealized gains (losses) on cash flow hedges	47	(129)	(10)
Net unrealized gains (losses) on pension and other postretirement plans	(4)	(14)	6
Other comprehensive income (loss)	180	(1,080)	(148)
Comprehensive income (loss)	1,096	(168)	862
Comprehensive income attributable to noncontrolling interest	19	12	11
Comprehensive income (loss) attributable to controlling interest	1,077	(180)	851
Income tax expense (benefit) of items included in other comprehensive income:
Net unrealized gains (losses) on securities available for sale	44	(302)	(46)
Net unrealized gains (losses) on cash flow hedges	15	(42)	(3)
Net unrealized gains (losses) on pension and other postretirement plans	$ (1)	$ (5)	$ 2