CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 339	$ (1,283)
Net change in unrealized gains (losses), net of tax:
Investment securities	(631)	758
Fair value option liabilities attributable to our own credit spread	(10)	407
Derivatives designated as cash flow hedges	(12)	90
Total other comprehensive income (loss)	(653)	1,255
Comprehensive loss	$ (314)	$ (28)