Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities:
Net income	$ 661	$ 502
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax (benefit)	(35)	(3)
Amortization of other intangible assets	50	52
Other non-cash adjustments for depreciation, amortization and accretion, net	248	212
Losses related to investment securities, net	2	40
Change in trading account assets, net	(85)	79
Change in accrued interest and fees receivable, net	(84)	(46)
Change in collateral deposits, net	6,011	(68)
Change in unrealized losses on foreign exchange derivatives, net	(2,205)	2,334
Change in other assets, net	(993)	(1,606)
Change in accrued expenses and other liabilities, net	1,091	1,908
Other, net	175	105
Net cash provided by operating activities	4,836	3,509
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	(12,191)	4,146
Net (increase) in securities purchased under resale agreements	(1,895)	(225)
Proceeds from sales of available-for-sale securities	11,720	2,165
Proceeds from maturities of available-for-sale securities	4,438	6,836
Purchases of available-for-sale securities	(3,922)	(6,287)
Proceeds from maturities of held-to-maturity securities	1,155	670
Purchases of held-to-maturity securities	(1,860)	(1,311)
Net (increase) in loans and leases	(6,280)	(2,769)
Purchases of equity investments and other long-term assets	(8)	(18)
Purchases of premises and equipment, net	(147)	(164)
Proceeds from sale of joint venture investment	0	172
Other, net	17	(5)
Net cash (used in) provided by investing activities	(8,973)	3,210
Financing Activities:
Net (decrease) in time deposits	(1,789)	(5,793)
Net increase in all other deposits	8,410	2,095
Net (decrease) in other short-term borrowings	(900)	(805)
Payments for long-term debt and obligations under capital leases	(515)	(11)
Purchases of common stock	(350)	(354)
Repurchases of common stock for employee tax withholding	(70)	(55)
Payments for cash dividends	(210)	(201)
Net cash provided by (used in) financing activities	4,576	(5,124)
Net increase	439	1,595
Cash and due from banks at beginning of period	2,107	1,314
Cash and due from banks at end of period	$ 2,546	$ 2,909