PARENT COMPANY FINANCIALS - Condensed Balance Sheets (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
ASSETS:
Cash and due from banks	[1]	$ 1,409	$ 1,794
Other assets	[1]	13,941	13,359
TOTAL ASSETS		217,521	221,964
LIABILITIES:
Long-term borrowed funds	[1]	12,401	13,467
Other liabilities	[1]	4,870	4,746
TOTAL LIABILITIES		193,267	197,622
Total stockholders’ equity		24,254	24,342	$ 23,690	$ 23,420
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY		217,521	221,964
Parent company
ASSETS:
Cash and due from banks		2,658	2,864
Other assets		237	194
TOTAL ASSETS		31,094	27,944
LIABILITIES:
Long-term borrowed funds		6,479
Other liabilities		360	258
TOTAL LIABILITIES		6,840	3,602
Total stockholders’ equity		24,254	24,342
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY		31,094	27,944
Bank subsidiaries | Parent company
ASSETS:
Loans and advances		3,326	1,152
Investments in subsidiaries		24,389	23,289
Nonbank subsidiaries | Parent company
ASSETS:
Loans and advances		150	154
Investments in subsidiaries		334	291
Unaffiliated companies | Parent company
LIABILITIES:
Long-term borrowed funds		$ 6,480	$ 3,344

[1] Includes amounts in consolidated VIEs. See Note 11 for additional information.