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		Dec. 31, 2023	Dec. 31, 2022
Cash and due from banks		$ 1,443	$ 1,758
Interest-bearing deposits with banks		8,059	4,524
Total loans, net of allowance for loan losses		51,425	52,792
Demand deposits (noninterest-bearing)		27,849	39,945
Time Deposits		8,286
Total deposits		66,762	71,397
Short-term borrowings		3,565	3,211
Medium- and long-term debt		6,206	3,024
Carrying Amount
Cash and due from banks		1,443	1,758
Interest-bearing deposits with banks		8,059	4,524
Other short-term investments		24	19
Total loans, net of allowance for loan losses		51,425	52,792
Demand deposits (noninterest-bearing)		58,476	69,460
Time Deposits		8,286	1,937
Total deposits		66,762	71,397
Short-term borrowings		3,565	3,211
Medium- and long-term debt		6,206	3,024
Credit-related financial instruments		(72)	(79)
Estimated Fair Value
Cash and due from banks		1,443	1,758
Interest-bearing deposits with banks		8,059	4,524
Other short-term investments		24	19
Total loans, net of allowance for loan losses	[1]	50,633	50,964
Demand deposits (noninterest-bearing)		58,476	69,460
Time Deposits		8,391	1,894
Total deposits		66,867	71,354
Short-term borrowings		3,565	3,211
Medium- and long-term debt		6,207	3,071
Credit-related financial instruments		(72)	(79)
Level 1 | Estimated Fair Value
Cash and due from banks		1,443	1,758
Interest-bearing deposits with banks		8,059	4,524
Other short-term investments		24	19
Total loans, net of allowance for loan losses		0	0
Demand deposits (noninterest-bearing)		0	0
Time Deposits		0	0
Total deposits		0	0
Short-term borrowings		3,565	3,211
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
Total loans, net of allowance for loan losses		0	0
Demand deposits (noninterest-bearing)		58,476	69,460
Time Deposits		8,391	1,894
Total deposits		66,867	71,354
Short-term borrowings		0	0
Medium- and long-term debt		6,207	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
Total loans, net of allowance for loan losses		50,633	50,964
Demand deposits (noninterest-bearing)		0	0
Time Deposits		0	0
Total deposits		0	0
Short-term borrowings		0	0
Medium- and long-term debt		0	0
Credit-related financial instruments		$ (72)	$ (79)

[1] Included $44 million and $66 million of loans recorded at fair value on a nonrecurring basis at December 31, 2023 and 2022, respectively.