Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities:
Net (loss) income including noncontrolling interests	$ (1,001)	$ 796
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
(Reversal of) provision for credit losses	189	43
Depreciation, amortization and accretion, net	425	297
Stock-based compensation—restricted stock units	63	58
Deferred income taxes	(204)	(119)
Net gains on sales of securities	(34)	(4)
Net decrease (increase) in securities borrowed or purchased under resale agreements	(1,258)	(371)
Net decrease (increase) in securities loaned or sold under repurchase agreements	2,296	594
Net decrease (increase) in trading account assets	(528)	(646)
Net decrease (increase) in other assets	(11)	(573)
Net increase (decrease) in trading account liabilities	(839)	429
Net increase (decrease) in other liabilities	164	62
Loans originated for sale	(1,880)	(1,215)
Net proceeds from sale of loans originated for sale	1,978	1,077
Pension and other benefits adjustment	(32)	(37)
Goodwill, Impairment Loss	1,614	0
Other, net	36	(20)
Total adjustments	1,979	(425)
Net cash provided by (used in) operating activities	978	371
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale	3,957	853
Proceeds from paydowns and maturities of securities available for sale	1,897	2,252
Purchases of securities available for sale	(5,719)	(4,697)
Proceeds from paydowns and maturities of securities held to maturity	3,893	1,262
Purchases of securities held to maturity	(3,023)	(772)
Proceeds from sales of loans	626	563
Net decrease (increase) in loans	(2,896)	(3,735)
Purchases of other investments	(75)	(188)
Other, net	(287)	(59)
Net cash provided by (used in) investing activities	(1,627)	(4,521)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	5,692	3,017
Net increase (decrease) in commercial paper and other short-term borrowings	(446)	1,241
Proceeds from issuance of long-term debt	2,331	4,058
Repayment of long-term debt	(4,319)	(3,367)
Other, net	(89)	(117)
Change in noncontrolling interests	(2)	0
Net cash provided by (used in) financing activities	3,167	4,832
Net change in cash, cash equivalents and restricted cash	2,518	682
Cash, cash equivalents and restricted cash at beginning of period	8,398	3,528
Cash, cash equivalents and restricted cash at end of period	10,916	4,210
Cash Paid During the Period For:
Interest	1,843	1,180
Income taxes, net	198	121
Supplemental Schedule of Noncash Investing and Financing Activities:
Securities available for sale transferred to securities held to maturity	599	10
securities held to maturity transferred to securities available for sale	170	0
Securities available for sale transferred to securities held to maturity	0	1,924
Lease assets upon adoption of ASU 2016-02, Leases	632	0
Lease liabilities upon adoption of ASU 2016-02, Leases	740	0
Reconciliation of Cash, Cash Equivalents and Restricted Cash:
Cash and cash equivalents	8,350
Total cash, cash equivalents and restricted cash per consolidated statement of cash flows	$ 8,398	$ 3,528