Parent Company Financial Statements - Condensed Balance Sheet - Parent Company Only (Details) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Available-for-sale debt and other securities		$ 39,547	$ 50,419
Equity securities		341	613
Goodwill		4,918	4,919	$ 4,915
Other assets	[1]	12,857	12,538
Total Assets		212,927	214,574
Liabilities
Other short-term borrowings		4,450	2,861
Accrued expenses and other liabilities	[1]	4,902	4,861
Long-term debt (external)	[1]	14,337	16,380
Total Liabilities		193,282	195,402
Equity
Common stock	[2]	2,051	2,051
Preferred stock	[3]	2,116	2,116
Capital surplus		3,804	3,757
Retained earnings		24,150	22,997
Accumulated other comprehensive loss		(4,636)	(4,487)
Treasury stock	[2]	(7,840)	(7,262)
Total Equity		19,645	19,172	17,327	$ 22,210
Total Liabilities and Equity		212,927	214,574
Parent Company
Assets
Cash		969	120	$ 120	$ 122
Other short-term investments		3,106	6,500
Available-for-sale debt and other securities		2,500	1,000
Equity securities		29	34
Loans to nonbank subsidiaries		5	0
Investment in nonbank subsidiaries		22,891	21,998
Goodwill		80	80
Other assets		156	179
Total Assets		29,736	29,911
Liabilities
Other short-term borrowings		3	0
Accrued expenses and other liabilities		567	631
Long-term debt (external)		9,521	10,108
Total Liabilities		10,091	10,739
Equity
Common stock		2,051	2,051
Preferred stock		2,116	2,116
Capital surplus		3,804	3,757
Retained earnings		24,150	22,997
Accumulated other comprehensive loss		(4,636)	(4,487)
Treasury stock		(7,840)	(7,262)
Total Equity		19,645	19,172
Total Liabilities and Equity		$ 29,736	$ 29,911

[1] Includes $51 and $55 of other short-term investments, $1,000 and $1,573 of portfolio loans and leases, $(19) and $(28) of ALLL, $5 and $10 of other assets, $12 and $14 of other liabilities and $889 and $1,409 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2024 and 2023, respectively. For further information, refer to Note 12.

[2] Common shares: Stated value $2.22 per share; authorized 2,000,000,000; outstanding at December 31, 2024 – 669,853,830 (excludes 254,038,751 treasury shares), 2023 – 681,124,810 (excludes 242,767,771 treasury shares).

[3] (c)500,000 shares of no par value preferred stock were authorized at both December 31, 2024 and 2023. There were 422,000 unissued shares of undesignated no par value preferred stock at both December 31, 2024 and 2023. Each issued share of no par value preferred stock has a liquidation preference of $25,000. 500,000 shares of no par value Class B preferred stock were authorized at both December 31, 2024 and 2023. There were 300,000 unissued shares of undesignated no par value Class B preferred stock at both December 31, 2024 and 2023. Each issued share of no par value Class B preferred stock has a liquidation preference of $1,000.