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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 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and due from banks | $ 1,228 | $ 1,758
Interest-bearing deposits with banks | 6,884 | 4,524
Demand deposits (noninterest-bearing) | 29,922 | 39,945
Customer certificates of deposit | 3,401 | 1,762
Other time deposits | 5,011 | 124
Total deposits | 67,158 | 71,397
Medium- and long-term debt | 6,049 | 3,024
Loans recorded at fair value | 52,704 | 52,792
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and due from banks | 1,228 | 1,758
Interest-bearing deposits with banks | 6,884 | 4,524
Other short-term investments | 24 | 19
Loans held-for-sale | 2 | 2
Total loans, net of allowance for loan losses | 52,704 | 52,792
Customers’ liability on acceptances outstanding | 1 | 3
Restricted equity investments | 453 | 223
Nonmarketable equity securities | 6 | 5
Demand deposits (noninterest-bearing) | 29,922 | 39,945
Interest-bearing deposits | 28,824 | 29,566
Customer certificates of deposit | 3,401 | 1,762
Other time deposits | 5,011 | 124
Total deposits | 67,158 | 71,397
Short-term borrowings | 4,812 | 3,211
Acceptances outstanding | 1 | 3
Medium- and long-term debt | 6,049 | 3,024
Credit-related financial instruments | (73) | (79)
Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and due from banks | 1,228 | 1,758
Interest-bearing deposits with banks | 6,884 | 4,524
Other short-term investments | 24 | 19
Loans held-for-sale | 2 | 2
Total loans, net of allowance for loan losses | 50,810 | 50,964
Customers’ liability on acceptances outstanding | 1 | 3
Restricted equity investments | 453 | 223
Nonmarketable equity securities | 12 | 12
Demand deposits (noninterest-bearing) | 29,922 | 39,945
Interest-bearing deposits | 28,824 | 29,566
Customer certificates of deposit | 3,372 | 1,719
Other time deposits | 5,106 | 124
Total deposits | 67,224 | 71,354
Short-term borrowings | 4,812 | 3,211
Acceptances outstanding | 1 | 3
Medium- and long-term debt | 5,781 | 3,071
Credit-related financial instruments | (73) | (79)
Level 1 | Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and due from banks | 1,228 | 1,758
Interest-bearing deposits with banks | 6,884 | 4,524
Other short-term investments | 24 | 19
Loans held-for-sale | 0 | 0
Total loans, net of allowance for loan losses | 0 | 0
Customers’ liability on acceptances outstanding | 1 | 3
Restricted equity investments | 453 | 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 | 4,812 | 3,211
Acceptances outstanding | 1 | 3
Medium- and long-term debt | 0 | 0
Credit-related financial instruments | 0 | 0
Level 2 | Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
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 | 2
Total loans, net of allowance for loan losses | 0 | 0
Customers’ liability on acceptances outstanding | 0 | 0
Restricted equity investments | 0 | 0
Demand deposits (noninterest-bearing) | 29,922 | 39,945
Interest-bearing deposits | 28,824 | 29,566
Customer certificates of deposit | 3,372 | 1,719
Other time deposits | 5,106 | 124
Total deposits | 67,224 | 71,354
Short-term borrowings | 0 | 0
Acceptances outstanding | 0 | 0
Medium- and long-term debt | 5,781 | 3,071
Credit-related financial instruments | 0 | 0
Level 3 | Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
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 | 0
Total loans, net of allowance for loan losses | 50,810 | 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 | (73) | (79)
Nonrecurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans recorded at fair value | 34 | 66
Nonrecurring | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loans held-for-sale | 236 |
Total loans, net of allowance for loan losses | $ 34 | $ 66

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