Fair Value Measurements (Estimated Fair Values Of Financial Instruments Not Recorded At Fair Value In Their Entirety On A Recurring Basis) (Details) - USD ($) $ in Millions		Mar. 31, 2023	Dec. 31, 2022
Cash and due from banks		$ 1,563	$ 1,758
Interest-bearing deposits with banks		9,171	4,524
Demand deposits (noninterest-bearing)		33,173	39,945
Customer certificates of deposit		2,077	1,762
Other time deposits		2,116	124
Total deposits		64,706	71,397
Medium- and long-term debt		7,084	3,024
Loans recorded at fair value		54,285	52,792
Carrying Amount
Cash and due from banks		1,563	1,758
Interest-bearing deposits with banks		9,171	4,524
Other short-term investments		19	19
Loans held-for-sale			2
Total loans	[1]	54,285	52,792
Customers’ liability on acceptances outstanding		3	3
Restricted equity investments		707	223
Nonmarketable equity securities	[2]	5	5
Demand deposits (noninterest-bearing)		33,173	39,945
Interest-bearing deposits		27,340	29,566
Customer certificates of deposit		2,077	1,762
Other time deposits		2,116	124
Total deposits		64,706	71,397
Short-term borrowings		11,016	3,211
Acceptances outstanding		3	3
Medium- and long-term debt		7,084	3,024
Credit-related financial instruments		(83)	(79)
Estimated Fair Value
Cash and due from banks		1,563	1,758
Interest-bearing deposits with banks		9,171	4,524
Other short-term investments		19	19
Loans held-for-sale			2
Total loans	[1]	53,828	50,964
Customers’ liability on acceptances outstanding		3	3
Restricted equity investments		707	223
Nonmarketable equity securities	[2]	11	12
Demand deposits (noninterest-bearing)		33,173	39,945
Interest-bearing deposits		27,340	29,566
Customer certificates of deposit		2,039	1,719
Other time deposits		2,131	124
Total deposits		64,683	71,354
Short-term borrowings		11,016	3,211
Acceptances outstanding		3	3
Medium- and long-term debt		6,826	3,071
Credit-related financial instruments		(83)	(79)
Level 1 | Estimated Fair Value
Cash and due from banks		1,563	1,758
Interest-bearing deposits with banks		9,171	4,524
Other short-term investments		19	19
Loans held-for-sale			0
Total loans	[1]	0	0
Customers’ liability on acceptances outstanding		3	3
Restricted equity investments		707	223
Demand deposits (noninterest-bearing)		0	0
Interest-bearing deposits		0	0
Customer certificates of deposit		0	0
Other time deposits		0	0
Total deposits		0	0
Short-term borrowings		11,016	3,211
Acceptances outstanding		3	3
Medium- and long-term debt		0	0
Credit-related financial instruments		0	0
Level 2 | Estimated Fair Value
Cash and due from banks		0	0
Interest-bearing deposits with banks		0	0
Other short-term investments		0	0
Loans held-for-sale			2
Total loans	[1]	0	0
Customers’ liability on acceptances outstanding		0	0
Restricted equity investments		0	0
Demand deposits (noninterest-bearing)		33,173	39,945
Interest-bearing deposits		27,340	29,566
Customer certificates of deposit		2,039	1,719
Other time deposits		2,131	124
Total deposits		64,683	71,354
Short-term borrowings		0	0
Acceptances outstanding		0	0
Medium- and long-term debt		6,826	3,071
Credit-related financial instruments		0	0
Level 3 | Estimated Fair Value
Cash and due from banks		0	0
Interest-bearing deposits with banks		0	0
Other short-term investments		0	0
Loans held-for-sale			0
Total loans	[1]	53,828	50,964
Customers’ liability on acceptances outstanding		0	0
Restricted equity investments		0	0
Demand deposits (noninterest-bearing)		0	0
Interest-bearing deposits		0	0
Customer certificates of deposit		0	0
Other time deposits		0	0
Total deposits		0	0
Short-term borrowings		0	0
Acceptances outstanding		0	0
Medium- and long-term debt		0	0
Credit-related financial instruments		(83)	(79)
Nonrecurring
Loans recorded at fair value		48	66
Nonrecurring | Level 3
Loans held-for-sale		186
Total loans		$ 48	$ 66

[1] Included $48 million and $66 million of loans recorded at fair value on a nonrecurring basis at March 31, 2023 and December 31, 2022, respectively.

[2] Certain investments that are measured at fair value using the net asset value have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Consolidated Balance Sheets.