Parent Company Financial Statements - Condensed Balance Sheet - Parent Company Only (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Available-for-sale debt and other securities	[1]	$ 51,503	$ 38,110
Equity securities		317	376
Goodwill		4,915	4,514	$ 4,258
Other assets	[2]	13,459	11,444
Total Assets		207,452	211,116
Liabilities
Other short-term borrowings		4,838	980
Accrued expenses and other liabilities	[2]	5,881	4,267
Long-term debt (external)	[2]	13,714	11,821
Total Liabilities		190,125	188,906
Equity
Common stock	[3]	2,051	2,051
Preferred stock	[4]	2,116	2,116
Capital surplus		3,684	3,624
Retained earnings		21,689	20,236
Accumulated other comprehensive (loss) income		(5,110)	1,207
Treasury stock	[3]	(7,103)	(7,024)
Total Equity		17,327	22,210	23,111	$ 21,203
Total Liabilities and Equity		207,452	211,116
Parent Company
Assets
Cash		120	122	$ 120	$ 118
Other short-term investments		5,667	6,234
Available-for-sale debt and other securities		1,000	0
Equity securities		34	49
Loans to nonbank subsidiaries		60	192
Investment in nonbank subsidiaries		20,256	23,877
Goodwill		80	80
Other assets		326	431
Total Assets		27,543	30,985
Liabilities
Other short-term borrowings		121	361
Accrued expenses and other liabilities		764	487
Long-term debt (external)		9,331	7,927
Total Liabilities		10,216	8,775
Equity
Common stock		2,051	2,051
Preferred stock		2,116	2,116
Capital surplus		3,684	3,624
Retained earnings		21,689	20,236
Accumulated other comprehensive (loss) income		(5,110)	1,207
Treasury stock		(7,103)	(7,024)
Total Equity		17,327	22,210
Total Liabilities and Equity		$ 27,543	$ 30,985

[1] Amortized cost of $57,530 and $36,941 at December 31, 2022 and 2021, respectively.

[2] Includes $17 and $24 of other short-term investments, $185 and $322 of portfolio loans and leases, $(2) and $(2) of ALLL, $2 and $2 of other assets, $9 and $1 of other liabilities and $118 and $263 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2022 and 2021, respectively. For further information, refer to Note 12.

[3] Common shares: Stated value $2.22 per share; authorized 2,000,000,000; outstanding at December 31, 2022 – 683,385,880 (excludes 240,506,701 treasury shares), 2021 – 682,777,664 (excludes 241,114,917 treasury shares).

[4] 500,000 shares of no par value preferred stock were authorized at both December 31, 2022 and 2021. There were 422,000 unissued shares of undesignated no par value preferred stock at both December 31, 2022 and 2021. 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, 2022 and 2021. There were 300,000 unissued shares of undesignated no par value Class B preferred stock at both December 31, 2022 and 2021. Each issued share of no par value Class B preferred stock has a liquidation preference of $1,000.