Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities:
Net income	$ 2,143	$ 1,980	$ 2,022
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax (benefit) expense	(358)	(168)	60
Amortization of other intangible assets	207	197	222
Other non-cash adjustments for depreciation, amortization and accretion, net	722	604	477
(Gains) losses related to investment securities, net	(7)	6	(4)
Change in trading account assets, net	(175)	75	(81)
Change in accrued interest and fees receivable, net	(298)	(104)	(119)
Change in collateral deposits, net	(18)	(6,662)	(4,362)
Change in unrealized (gains) losses on foreign exchange derivatives, net	(1,057)	982	(2,042)
Change in other assets, net	1,772	1,156	3,612
Change in accrued expenses and other liabilities, net	(1,147)	(48)	(635)
Other, net	506	579	289
Net cash provided by (used in) operating activities	2,290	(1,403)	(561)
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	4,403	18,185	(29,266)
Net (increase) decrease in securities purchased under resale agreements	1,448	(1,014)	3,840
Proceeds from sales of available-for-sale securities	1,401	12,309	9,766
Proceeds from maturities of available-for-sale securities	30,070	28,025	36,120
Purchases of available-for-sale securities	(30,162)	(25,397)	(43,146)
Proceeds from maturities of available-for-sale securities	7,942	3,842	3,217
Purchases of held-to-maturity securities	(8,425)	(9,398)	(3,778)
Net increase in loans and leases	(924)	(561)	(4,785)
Business acquisitions	(437)	0	0
Purchases of equity investments and other long-term assets	(643)	(366)	(182)
Purchases of premises and equipment, net	(613)	(703)	(427)
Other, net	170	73	149
Net cash provided by (used in) investing activities	4,230	24,995	(28,492)
Financing Activities:
Net increase (decrease) in time deposits	8,488	(9,878)	54,404
Net decrease in all other deposits	(12,952)	(7,535)	(27,632)
Net increase (decrease) in other short-term borrowings	(268)	(7,074)	1,575
Proceeds from issuance of long-term debt, net of issuance costs	1,492	2,983	994
Payments for long-term debt and obligations under capital leases	(1,441)	(1,155)	(788)
Proceeds from issuance of preferred stock, net	493	742	1,470
Proceeds from exercises of common stock options	0	4	14
Purchases of common stock	(1,365)	(1,520)	(1,650)
Excess tax benefit related to stock-based compensation	13	70	72
Repurchases of common stock for employee tax withholding	(122)	(222)	(232)
Payments for cash dividends	(723)	(655)	(539)
Other, net	(28)	0	0
Net cash (used in) provided by financing activities	(6,413)	(24,240)	27,688
Net increase (decrease)	107	(648)	(1,365)
Cash and due from banks at beginning of period	1,207	1,855	3,220
Cash and due from banks at end of period	1,314	1,207	1,855
Supplemental disclosure:
Interest paid	441	385	398
Income taxes paid, net	$ 371	$ 211	$ 358