CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 393	$ 548	$ 688
Net change in unrealized gains (losses), net of tax:
Investment securities	536	(2,205)	(815)
Fair value option liabilities attributable to our own credit spread	(25)	59	12
Derivatives designated as cash flow hedges	136	(258)	(59)
Pension and post-retirement benefit plans	2	8	4
Total other comprehensive income (loss)	649	(2,396)	(858)
Comprehensive income (loss)	$ 1,042	$ (1,848)	$ (170)