Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net income including noncontrolling interests	$ 179	$ 167
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Reversal of) provision for credit losses	38	(2)
Depreciation, amortization and accretion, net	96	92
Stock-based compensation—restricted stock units	17	17
Deferred income taxes	(88)	(90)
Net gains on sales of securities	(1)	0
Net decrease (increase) in securities borrowed or purchased under resale agreements	(492)	992
Net decrease (increase) in securities loaned or sold under repurchase agreements	140	(46)
Net decrease (increase) in trading account assets	324	(1,998)
Net decrease (increase) in other assets	89	448
Net increase (decrease) in trading account liabilities	(131)	274
Net increase (decrease) in other liabilities	491	(51)
Loans originated for sale	(234)	(255)
Net proceeds from sale of loans originated for sale	612	260
Pension and other benefits adjustment	(10)	(13)
Other, net	(1)	29
Total adjustments	850	(343)
Net cash provided by (used in) operating activities	1,029	(176)
Cash Flows from Investing Activities:
Proceeds from sales of securities available for sale	676	9
Proceeds from paydowns and maturities of securities available for sale	490	880
Purchases of securities available for sale	(1,760)	(1,417)
Proceeds from paydowns and maturities of securities held to maturity	1,170	386
Purchases of securities held to maturity	(850)	0
Proceeds from sales of loans	121	240
Net decrease (increase) in loans	(1,002)	(1,308)
Purchases of other investments	(20)	(36)
Other, net	(204)	(68)
Net cash provided by (used in) investing activities	(1,379)	(1,314)
Cash Flows from Financing Activities:
Net increase (decrease) in deposits	1,927	(1,258)
Net increase (decrease) in commercial paper and other short-term borrowings	(420)	1,988
Proceeds from issuance of long-term debt	1,300	2,755
Repayment of long-term debt	(1,886)	(815)
Other, net	0	(21)
Net cash provided by (used in) financing activities	921	2,649
Net change in cash, cash equivalents and restricted cash	571	1,159
Cash, cash equivalents and restricted cash at beginning of period	8,398	3,528
Cash, cash equivalents and restricted cash at end of period	8,969	4,687
Cash Paid During the Period For:
Interest	706	311
Income taxes, net	21	25
Supplemental Schedule of Noncash Investing and Financing Activities:
Securities available for sale transferred to securities held to maturity	71	(91)
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