CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 688	$ (940)	$ 113
Net change in unrealized gains (losses), net of tax:
Investment securities	(815)	864	403
Fair value option liabilities attributable to our own credit spread	12	24	(310)
Derivatives designated as cash flow hedges	(59)	72	8
Pension and post-retirement benefit plans	4	(4)	(14)
Total other comprehensive income (loss)	(858)	956	87
Comprehensive income (loss)	$ (170)	$ 16	$ 200