Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities:
Net income	$ 1,550	$ 1,404
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax expense (benefit)	31	(12)
Amortization of other intangible assets	153	147
Other non-cash adjustments for depreciation, amortization and accretion, net	517	444
(Gains) losses related to investment securities, net	(5)	6
Change in trading account assets, net	(214)	(299)
Change in accrued interest and fees receivable, net	(248)	(29)
Change in collateral deposits, net	(615)	(8,077)
Change in unrealized losses on foreign exchange derivatives, net	853	434
Change in other assets, net	(457)	687
Change in accrued expenses and other liabilities, net	399	128
Other, net	312	385
Net cash provided by (used in) operating activities	2,276	(4,782)
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	(3,752)	25,162
Net decrease (increase) in securities purchased under resale agreements	962	(6,765)
Proceeds from sales of available-for-sale securities	424	12,417
Proceeds from maturities of available-for-sale securities	21,564	20,258
Purchases of available-for-sale securities	(22,625)	(19,494)
Proceeds from maturities of available-for-sale securities	7,184	2,835
Purchases of held-to-maturity securities	(5,581)	(2,962)
Net increase in loans and leases	(2,678)	(837)
Business acquisitions	(437)	0
Purchases of equity investments and other long-term assets	(265)	(353)
Purchases of premises and equipment, net	(477)	(543)
Other, net	129	75
Net cash (used in) provided by investing activities	(5,552)	29,793
Financing Activities:
Net (decrease) increase in time deposits	9,077	(5,933)
Net decrease in all other deposits	(1,938)	(16,740)
Net decrease in other short-term borrowings	(476)	(1,781)
Proceeds from issuance of long-term debt, net of issuance costs	1,492	2,995
Payments for long-term debt and obligations under capital leases	(1,430)	(914)
Proceeds from issuance of preferred stock, net	493	742
Proceeds from exercises of common stock options	0	4
Purchases of common stock	(1,029)	(961)
Excess tax benefit related to stock-based compensation	6	60
Repurchases of common stock for employee tax withholding	(95)	(189)
Payments for cash dividends	(541)	(489)
Net cash provided by (used in) financing activities	5,559	(23,206)
Net increase	2,283	1,805
Cash and due from banks at beginning of period	1,207	1,855
Cash and due from banks at end of period	$ 3,490	$ 3,660