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		Jun. 30, 2024	Dec. 31, 2023
Cash and due from banks		$ 719	$ 1,443
Interest-bearing deposits with banks		4,093	8,059
Total deposits		62,459	66,762
Medium- and long-term debt		7,112	6,206
Loans recorded at fair value		51,164	51,425
Carrying Amount
Cash and due from banks		719	1,443
Interest-bearing deposits with banks		4,093	8,059
Other short-term investments		21	24
Total loans	[1]	51,164	51,425
Demand Deposit Accounts		55,785	58,476
Time Deposits		6,674	8,286
Total deposits		62,459	66,762
Medium- and long-term debt		7,112	6,206
Short-term borrowings		1,250	3,565
Credit-related financial instruments		(63)	(72)
Estimated Fair Value
Cash and due from banks		719	1,443
Interest-bearing deposits with banks		4,093	8,059
Other short-term investments		21	24
Total loans	[1]	50,412	50,633
Demand Deposit Accounts		55,785	58,476
Time Deposits		6,682	8,391
Total deposits		62,467	66,867
Medium- and long-term debt		7,190	6,207
Short-term borrowings		1,250	3,565
Credit-related financial instruments		(63)	(72)
Level 1 | Estimated Fair Value
Cash and due from banks		719	1,443
Interest-bearing deposits with banks		4,093	8,059
Other short-term investments		21	24
Total loans	[1]	0	0
Demand Deposit Accounts		0	0
Time Deposits		0	0
Total deposits		0	0
Medium- and long-term debt		0	0
Short-term borrowings		1,250	3,565
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	[1]	0	0
Demand Deposit Accounts		55,785	58,476
Time Deposits		6,682	8,391
Total deposits		62,467	66,867
Medium- and long-term debt		7,190	6,207
Short-term borrowings		0	0
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	[1]	50,412	50,633
Demand Deposit Accounts		0	0
Time Deposits		0	0
Total deposits		0	0
Medium- and long-term debt		0	0
Short-term borrowings		0	0
Credit-related financial instruments		(63)	(72)
Nonrecurring
Loans recorded at fair value		82	44
Nonrecurring | Level 3
Total loans		$ 82	$ 44

[1] Included $82 million and $44 million of loans recorded at fair value on a nonrecurring basis at June 30, 2024 and December 31, 2023, respectively.