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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | $ 9,333 | $ 10,647
Debt Securities, Held-to-maturity | 9,566 | 10,153
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 3,411 | 1,406
Short-term debt | 1,474 | 999
Long-term debt | 14,311 | 15,169
Total liabilities | 143,984 | 140,340
Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,198 | 1,192
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 0 | 0
Short-term Debt, Fair Value | 0 | 0
Long-term Debt, Fair Value | 0 | 0
Trust preferred securities | 0 | 0
Total liabilities | 0 | 0
Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 8,135 | 9,455
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 3,411 | 1,406
Short-term Debt, Fair Value | 1,473 | 1,019
Long-term Debt, Fair Value | 13,122 | 16,848
Trust preferred securities | 395 | 460
Total liabilities | 18,401 | 19,733
Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 0 | 0
Short-term Debt, Fair Value | 0 | 0
Long-term Debt, Fair Value | 0 | 0
Trust preferred securities | 0 | 0
Total liabilities | 0 | 0
Estimate of Fair Value Measurement [Member] |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 3,411 | 1,406
Short-term Debt, Fair Value | 1,473 | 1,019
Long-term Debt, Fair Value | 13,122 | 16,848
Trust preferred securities | 395 | 460
Total liabilities | 18,401 | 19,733
Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 9,532 | 10,118
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 3,411 | 1,406
Short-term debt | 1,474 | 999
Long-term debt | 14,311 | 15,169
Trust preferred securities | 308 | 308
Total liabilities | 19,504 | 17,882
U.S. Treasury / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,273 | 1,244
Debt Securities, Held-to-maturity | 1,298 | 1,213
U.S. Treasury / Agency | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,198 | 1,192
U.S. Treasury / Agency | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 75 | 52
U.S. Treasury / Agency | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
U.S. Treasury / Agency | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 1,298 | 1,213
Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,071 | 1,262
Debt Securities, Held-to-maturity | 1,112 | 1,201
Non-U.S. | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
Non-U.S. | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,071 | 1,262
Non-U.S. | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
Non-U.S. | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 1,108 | 1,196
Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,746 | 2,201
Debt Securities, Held-to-maturity | 1,844 | 2,032
Corporate and asset-backed securities | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
Corporate and asset-backed securities | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,746 | 2,201
Corporate and asset-backed securities | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
Corporate and asset-backed securities | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 1,816 | 2,004
Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,598 | 1,803
Debt Securities, Held-to-maturity | 1,651 | 1,731
Mortgage-backed securities | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
Mortgage-backed securities | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,598 | 1,803
Mortgage-backed securities | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
Mortgage-backed securities | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 1,650 | 1,730
Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 3,645 | 4,137
Debt Securities, Held-to-maturity | 3,661 | 3,976
Municipal | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
Municipal | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 3,645 | 4,137
Municipal | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 0 | 0
Municipal | Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | $ 3,660 | $ 3,975

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