CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (1,283)	$ 109
Net change in unrealized gains (losses), net of tax:
Investment securities	758	179
Fair value option liabilities attributable to our own credit spread	407	(111)
Derivatives designated as cash flow hedges	90	14
Pension and post-retirement benefit plans	0	(3)
Total other comprehensive income	1,255	79
Comprehensive income (loss)	$ (28)	$ 188