Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Net income	$ 2,693	$ 2,420	$ 2,242
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income tax (benefit)	(162)	(194)	(130)
Amortization of other intangible assets	245	234	236
Other non-cash adjustments for depreciation, amortization and accretion, net	1,312	1,276	1,101
Losses (gains) related to investment securities, net	(57)	(4)	1
Provision for credit losses	(33)	88	10
Change in trading account assets, net	57	99	(54)
Change in accrued interest and fees receivable, net	(173)	127	(28)
Change in collateral deposits, net	(7,662)	(2,951)	287
Change in unrealized losses (gains) on foreign exchange derivatives, net	(3,448)	3,652	2,034
Change in other assets, net	691	(1,406)	(713)
Change in accrued expenses and other liabilities, net	(574)	(170)	294
Other, net	401	361	410
Net cash (used in) provided by operating activities	(6,710)	3,532	5,690
Investing Activities:
Net (increase) decrease in interest-bearing deposits with banks	10,602	(47,995)	4,075
Net (increase) decrease in securities purchased under resale agreements	94	(1,619)	3,192
Proceeds from sales of available-for-sale securities	12,822	2,645	5,642
Proceeds from maturities of available-for-sale securities	23,484	23,644	20,407
Purchases of available-for-sale securities	(53,750)	(37,873)	(38,164)
Purchases of held-to-maturity securities under the MMLF program	0	(29,242)	0
Proceeds from maturities of held-to-maturity securities under the MMLF program	3,299	25,984	0
Proceeds from maturities of held-to-maturity securities	15,586	15,179	10,390
Purchases of held-to-maturity securities	(8,583)	(13,981)	(6,938)
Sale of loans	172	324	131
Net (increase) in loans	(4,779)	(1,939)	(650)
Business acquisitions, net of cash acquired	(346)	0	(54)
Divestitures	13	0	0
Purchases of equity investments and other long-term assets	(216)	(1,436)	(647)
Purchases of premises and equipment, net	(811)	(560)	(730)
Other, net	241	1,335	720
Net cash provided by (used in) investing activities	(2,172)	(65,534)	(2,626)
Financing Activities:
Net (decrease) in time deposits	(363)	(33,466)	(11,255)
Net increase in all other deposits	15,611	91,391	12,767
Net (decrease) increase in securities sold under repurchase agreements	(1,838)	2,311	20
Net (decrease) increase in short-term borrowings under money market liquidity facility	(3,302)	3,302	0
Net (decrease) in other short-term borrowings	(557)	(154)	(2,253)
Proceeds from issuance of long-term debt, net of issuance costs	1,343	2,489	1,495
Payments for long-term debt and obligations under finance leases	(1,443)	(1,724)	(402)
Payments for redemption of preferred stock	(500)	(500)	(750)
Proceeds from issuance of common stock, net of issuance costs	1,900	0	0
Repurchases of common stock	(900)	(515)	(1,585)
Repurchases of common stock for employee tax withholding	(39)	(78)	(81)
Payments for cash dividends	(866)	(889)	(930)
Net cash provided by (used in) financing activities	9,046	62,167	(2,974)
Net increase	164	165	90
Cash and due from banks at beginning of period	3,467	3,302	3,212
Cash and due from banks at end of period	3,631	3,467	3,302
Supplemental disclosure:
Interest paid	37	375	1,382
Income taxes paid, net	$ 559	$ 403	$ 510