Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net income including noncontrolling interests	$ 496	$ 509
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Reversal of) provision for credit losses	(21)	(52)
Depreciation, amortization and accretion, net	166	169
Stock-based compensation—restricted stock units	38	30
Deferred income taxes	(64)	227
Net gains on sales of securities	(3)	(9)
Net decrease (increase) in securities borrowed or purchased under resale agreements	846	(73)
Net decrease (increase) in securities loaned or sold under repurchase agreements	(858)	181
Net decrease (increase) in trading account assets	(1,753)	(1,071)
Net decrease (increase) in other assets	(87)	161
Net increase (decrease) in trading account liabilities	1,391	658
Net increase (decrease) in other liabilities	(225)	(424)
Loans originated for sale	(880)	(300)
Net proceeds from sale of loans originated for sale	623	357
Pension and other benefits adjustment	(25)	(142)
Other, net	(5)	21
Total adjustments	(857)	(267)
Net cash provided by (used in) operating activities	(361)	242
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale	627	1,327
Proceeds from paydowns and maturities of securities available for sale	1,444	1,156
Purchases of securities available for sale	(2,729)	(4,065)
Proceeds from paydowns and maturities of securities held to maturity	811	821
Purchases of securities held to maturity	0	(916)
Proceeds from sales of loans	514	646
Net decrease (increase) in loans	(2,217)	(1,381)
Purchases of other investments	(153)	(113)
Other, net	(55)	1
Net cash provided by (used in) investing activities	(1,758)	(2,524)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	724	(2,008)
Net increase (decrease) in commercial paper and other short-term borrowings	2,686	3,830
Proceeds from issuance of senior debt	0	3,522
Proceeds from issuance of long-term debt	4,050	0
Repayment of long-term debt	(1,995)	(4,379)
Other, net	(84)	(55)
Change in noncontrolling interests	0	(9)
Net cash provided by (used in) financing activities	5,381	901
Net change in cash, cash equivalents and restricted cash	3,262	(1,381)
Cash, cash equivalents and restricted cash at beginning of period	3,528	5,834
Cash, cash equivalents and restricted cash at end of period	6,790	4,453
Cash Paid During the Period For:
Interest	698	389
Income taxes, net	72	157
Supplemental Schedule of Noncash Investing and Financing Activities:
Securities available for sale transferred to securities held to maturity	(67)	356
Securities available for sale transferred to securities held to maturity	2,006	0
Reconciliation of Cash, Cash Equivalents and Restricted Cash:
Cash and cash equivalents	3,392
Total cash, cash equivalents and restricted cash per consolidated statement of cash flows	$ 3,528	$ 5,834