Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities:
Net income	$ 2,242	$ 2,593	$ 2,156
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax expense (benefit)	(130)	(136)	92
Amortization of other intangible assets	236	226	214
Other non-cash adjustments for depreciation, amortization and accretion, net	1,101	977	871
Losses (gains) related to investment securities, net	1	(6)	39
Change in trading account assets, net	(54)	233	(69)
Change in accrued interest and fees receivable, net	(28)	26	(455)
Change in collateral deposits, net	287	7,326	1,819
Change in unrealized losses (gains) on foreign exchange derivatives, net	2,034	(1,836)	3,267
Change in other assets, net	(713)	(22)	(1,334)
Change in accrued expenses and other liabilities, net	294	394	33
Other, net	420	400	307
Net cash provided by operating activities	5,690	10,175	6,940
Investing Activities:
Net decrease (increase) in interest-bearing deposits with banks	4,075	(5,813)	3,708
Net decrease (increase) in securities purchased under resale agreements	3,192	(1,438)	(1,285)
Proceeds from sales of available-for-sale securities	5,642	26,082	12,439
Proceeds from maturities of available-for-sale securities	20,407	14,645	28,878
Purchases of available-for-sale securities	(38,164)	(31,814)	(34,841)
Proceeds from maturities of held-to-maturity securities	10,390	6,296	4,028
Purchases of held-to-maturity securities	(6,938)	(6,539)	(8,772)
Net (increase) in loans and leases	(519)	(2,461)	(3,511)
Business acquisitions, net of cash acquired	(54)	(2,595)	0
Purchases of equity investments and other long-term assets	(647)	(326)	(233)
Purchases of premises and equipment, net	(730)	(609)	(637)
Proceeds from sale of joint venture investment	0	0	172
Other, net	720	76	102
Net cash (used in) provided by investing activities	(2,626)	(4,496)	48
Financing Activities:
Net (decrease) increase in time deposits	(11,255)	6,673	(15,306)
Net increase (decrease) in all other deposits	12,767	(11,209)	13,040
Net (decrease) increase in other short-term borrowings	(2,233)		(1,999)
Net (decrease) increase in other short-term borrowings		188
Proceeds from issuance of long-term debt, net of issuance costs	1,495	995	747
Payments for long-term debt and obligations under finance leases	(402)	(1,461)	(493)
Payments for redemption of preferred stock	(750)	0	0
Proceeds from issuance of preferred stock, net of issuance costs	0	495	0
Proceeds from issuance of common stock, net of issuance costs	0	1,150	0
Repurchases of common stock	(1,585)	(350)	(1,292)
Excess tax benefit related to stock-based compensation	0	0
Repurchases of common stock for employee tax withholding	(81)	(124)	(126)
Payments for cash dividends	(930)	(828)	(768)
Other, net	0	0	9
Net cash (used in) financing activities	(2,974)	(4,471)	(6,188)
Net increase	90	1,208	800
Cash and due from banks at beginning of period	3,212	2,004	1,204
Cash and due from banks at end of period	3,302	3,212	2,004
Supplemental disclosure:
Interest paid	1,382	981	593
Income taxes paid, net	$ 510	$ 549	$ 345