Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows from Operating Activities:
Net income (loss) including noncontrolling interests	$ 684	$ (292)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Reversal of) provision for credit losses	(349)	831
Depreciation, amortization and accretion, net	210	300
Stock-based compensation—restricted stock units	53	42
Deferred income taxes	12	(232)
Net gains on sales of securities	(34)	(110)
Net decrease (increase) in securities borrowed or purchased under resale agreements	1,940	6,862
Net increase (decrease) in securities loaned or sold under repurchase agreements	(4,329)	(6,779)
Net decrease (increase) in trading account assets	1,689	(2,077)
Net decrease (increase) in other assets	280	1,194
Net increase (decrease) in trading account liabilities	76	(10)
Net increase (decrease) in other liabilities	(57)	353
Loans originated for sale	(4,862)	(2,560)
Net proceeds from sale of loans originated for sale	4,733	2,056
Pension and other benefits adjustment	(21)	(10)
Other, net	(42)	8
Total adjustments	(701)	(132)
Net cash provided by (used in) operating activities	(17)	(424)
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale	1,004	3,375
Proceeds from paydowns and maturities of securities available for sale	1,872	1,226
Purchases of securities available for sale	(5,705)	(1,785)
Proceeds from paydowns and maturities of securities held to maturity	1,309	1,306
Purchases of securities held to maturity	(1,756)	0
Proceeds from sales of loans	113	409
Net decrease (increase) in loans	3,411	1,449
Purchases of other investments	(71)	(176)
Other, net	(117)	(145)
Net cash provided by (used in) investing activities	60	5,659
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	1,567	6,711
Net increase (decrease) in commercial paper and other short-term borrowings	(24)	(3,792)
Proceeds from issuance of long-term debt	2,140	613
Repayment of long-term debt	(2,628)	(958)
Other, net	(111)	(50)
Change in noncontrolling interests	2	0
Net cash provided by (used in) financing activities	946	2,524
Net change in cash, cash equivalents and restricted cash	989	7,759
Cash, cash equivalents and restricted cash at beginning of period	16,445	9,695
Cash, cash equivalents and restricted cash at end of period	17,434	17,454
Cash Paid During the Period For:
Interest	248	730
Income taxes, net	229	41
Supplemental Schedule of Noncash Investing and Financing Activities:
Net transfer of loans held for investment to (from) loans held for sale		(44)
Net transfer of loans held for investment to (from) loans held for sale	76
Reconciliation of Cash, Cash Equivalents and Restricted Cash:
Cash and cash equivalents	16,414
Restricted cash included in other assets	36	33
Total cash, cash equivalents and restricted cash per consolidated statements of cash flows	$ 17,434	$ 17,454