CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income (loss)		$ 109	$ (238)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization		11	(18)
Provision for credit losses		58	(71)
Net realized gains on securities available-for-sale		(7)	(5)
Net change in other assets and liabilities		1,326	(122)
Net change in loans held for sale:
Originations and purchases of loans held for sale		(593)	(923)
Sales and collections of loans held for sale		621	1,175
Net change in trading assets and liabilities		(3,858)	(18,061)
Lower of amortized cost or fair value adjustments on loans held for sale		0	(3)
Loss (gain) on instruments designated at fair value and related derivatives		9	(30)
Net cash used in operating activities		(2,324)	(18,296)
Cash flows from investing activities
Net change in federal funds sold and securities purchased under agreements to resell		3,244	22,804
Securities available-for-sale:
Purchases of securities available-for-sale		(4,408)	(2,161)
Proceeds from sales of securities available-for-sale		2,145	987
Proceeds from maturities of securities available-for-sale		2,123	948
Securities held-to-maturity:
Purchases of securities held-to-maturity		(229)	(900)
Proceeds from maturities of securities held-to-maturity		509	591
Change in loans:
Originations, net of collections		(2,413)	5,012
Loans sold to third parties		381	207
Net cash used for acquisitions of properties and equipment		(8)	0
Outflows related to the sale of a portion of our Private Banking business		(2)	(232)
Other, net		(1)	(11)
Net cash provided by investing activities		1,341	27,245
Cash flows from financing activities
Net change in deposits		2,479	(375)
Debt:
Net change in short-term borrowings		5,387	487
Issuance of long-term debt		1,829	1,517
Repayment of long-term debt		(2,091)	(3,899)
Return of capital to parent		(2,400)	0
Other decreases in capital surplus		0	(3)
Net cash provided by (used in) financing activities		5,204	(2,273)
Net change in cash and due from banks and interest bearing deposits with banks(1)	[1]	4,221	6,676
Cash and due from banks and interest bearing deposits with banks at beginning of period	[1]	17,214	12,272
Cash and and due from banks and interest bearing deposits with banks at end of period	[1]	$ 21,435	18,948
Adjustments for New Accounting Pronouncement [Member]
Debt:
Net change in cash and due from banks and interest bearing deposits with banks(1)	[1]		$ 6,968

[1] As a result of adopting new accounting guidance in 2018, we changed our presentation of cash and cash equivalents to include cash and due from banks as well as interest bearing deposits with banks, which includes restricted cash. See Note 2, "Summary of Significant Accounting Policies and New Accounting Pronouncements," in our 2018 Form 10-K for further discussion. This resulted in an increase in cash provided by investing activities of $6,968 million during the three months ended March 31, 2018.