PARENT COMPANY FINANCIALS - Condensed Cash Flow Statements (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net income		$ 2,073	$ 2,319	$ 1,057
Adjustments to reconcile net income to net change in cash due to operating activities:
Deferred income taxes		57	(429)	(238)
Net increase (decrease) in other liabilities		1,036	757	1,001
Net (increase) decrease in other assets		(1,894)	(1,719)	(3,979)
Net change due to operating activities		4,119	2,275	111
INVESTING ACTIVITIES
Acquisitions, net of cash acquired	[1]	(255)	(165)	(3)
Other investing, net		(771)	(316)	(65)
Net change due to investing activities		(12,637)	(10,486)	(6,136)
FINANCING ACTIVITIES
Proceeds from issuance of long-term borrowed funds		24,617	0	8,323
Repayments of long-term borrowed funds		(19,691)	(1,352)	(14,022)
Treasury stock purchased		(153)	(295)	(270)
Net proceeds from issuance of preferred stock		0	296	395
Redemption of preferred stock		0	(250)	0
Dividends declared and paid to preferred stockholders		(113)	(113)	(98)
Net change due to financing activities		9,907	4,636	15,372
Net change in cash and cash equivalents	[2]	1,389	(3,575)	9,347
Cash and cash equivalents at beginning of period	[2]	9,158	12,733	3,386
Cash and cash equivalents at end of period	[2]	10,547	9,158	12,733
Parent company
OPERATING ACTIVITIES
Net income		2,073	2,319	1,057
Adjustments to reconcile net income to net change in cash due to operating activities:
Deferred income taxes		(11)	0	17
Equity in undistributed income of subsidiaries		(1,651)	(1,207)	(177)
Net increase (decrease) in other liabilities		(7)	34	43
Net (increase) decrease in other assets		(44)	12	(41)
Other operating, net		92	67	48
Net change due to operating activities		452	1,225	947
INVESTING ACTIVITIES
Investments in and advances to subsidiaries		(156)	(196)	(190)
Repayment of investments in and advances to subsidiaries		121	125	205
Acquisitions, net of cash acquired		(23)	(165)	0
Other investing, net		(1)	(1)	(1)
Net change due to investing activities		(59)	(237)	14
FINANCING ACTIVITIES
Proceeds from issuance of long-term borrowed funds		414	0	1,053
Repayments of long-term borrowed funds		(182)	(350)	(12)
Treasury stock purchased		(153)	(295)	(270)
Net proceeds from issuance of preferred stock		0	296	395
Redemption of preferred stock		0	(250)	0
Dividends declared and paid to common stockholders		(779)	(670)	(672)
Dividends declared and paid to preferred stockholders		(113)	(113)	(98)
Other financing, net		(25)	(20)	(95)
Net change due to financing activities		(838)	(1,402)	301
Net change in cash and cash equivalents		(445)	(414)	1,262
Cash and cash equivalents at beginning of period		2,266	2,680	1,418
Cash and cash equivalents at end of period		$ 1,821	$ 2,266	$ 2,680

[1] Primarily includes cash paid of $355 million to acquire Investors less $287 million in cash acquired, and $143 million and $23 million of cash paid for the HSBC transaction and acquisition of DH Capital, respectively, for the year ended December 31, 2022. See Note 2 for more detailed information regarding these acquisitions.

[2] Cash and cash equivalents include cash and due from banks and interest-bearing cash and due from banks as reflected on the Consolidated Balance Sheets