CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ 339	$ (1,283)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	60	77
Goodwill impairment	0	784
Provision for credit losses	(227)	726
Net realized gains on securities available-for-sale	(29)	(28)
Net change in other assets and liabilities	685	(4,613)
Net change in loans held for sale:
Originations and purchases of loans held for sale	(569)	(1,239)
Sales and collections of loans held for sale	662	1,184
Net change in trading assets and liabilities	(1,616)	(77)
Lower of amortized cost or fair value adjustments on loans held for sale	0	(1)
Loss (gain) on instruments designated at fair value and related derivatives	(18)	22
Net cash used in operating activities	(713)	(4,448)
Cash flows from investing activities
Net change in federal funds sold and securities purchased under agreements to resell	31,986	13,195
Securities available-for-sale:
Purchases of securities available-for-sale	(4,001)	(9,918)
Proceeds from sales of securities available-for-sale	3,907	4,630
Proceeds from paydowns and maturities of securities available-for-sale	4,593	2,295
Securities held-to-maturity:
Purchases of securities held-to-maturity	0	(515)
Proceeds from paydowns and maturities of securities held-to-maturity	1,133	817
Change in loans:
Collections, net of originations	61	(13,510)
Loans sold to third parties	392	299
Net cash provided by disposals of properties and equipment	4	7
Other, net	59	(213)
Net cash provided by (used in) investing activities	38,134	(2,913)
Cash flows from financing activities
Net change in deposits	3,473	14,153
Debt:
Net change in short-term borrowings	291	13,920
Issuance of long-term debt	2,288	5,844
Repayment of long-term debt	(4,071)	(2,864)
Other increases (decreases) in capital surplus	(3)	5
Net cash provided by financing activities	1,978	31,058
Net change in cash and due from banks and interest bearing deposits with banks	39,399	23,697
Cash and due from banks and interest bearing deposits with banks at beginning of period	15,655	3,782
Cash and due from banks and interest bearing deposits with banks at end of period	$ 55,054	$ 27,479