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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | $ 10,647 | $ 12,510
Debt Securities, Held-to-maturity | 10,153 | 11,697
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,406 | 1,405
Short-term debt | 999 | 0
Long-term debt | 15,169 | 14,948
Total liabilities | 140,340 | 131,333
US Treasury and Government [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,244 | 1,452
Debt Securities, Held-to-maturity | 1,213 | 1,392
Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,262 | 1,405
Debt Securities, Held-to-maturity | 1,201 | 1,295
Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 2,201 | 2,438
Debt Securities, Held-to-maturity | 2,032 | 2,185
Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,803 | 2,146
Debt Securities, Held-to-maturity | 1,731 | 2,000
States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 4,137 | 5,069
Debt Securities, Held-to-maturity | 3,976 | 4,825
Estimate of Fair Value Measurement [Member] |  |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,406 | 1,405
Short-term debt, Fair Value | 1,019 |
Long-term debt, Fair Value | 16,848 | 17,487
Trust preferred securities | 460 | 473
Total liabilities | 19,733 | 19,365
Reported Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 10,118 | 11,653
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,406 | 1,405
Short-term debt | 999 |
Long-term debt | 15,169 | 14,948
Trust preferred securities | 308 | 308
Total liabilities | 17,882 | 16,661
Reported Value Measurement | US Treasury and Government [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 1,213 | 1,392
Reported Value Measurement | Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 1,196 | 1,288
Reported Value Measurement | Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 2,004 | 2,150
Reported Value Measurement | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 1,730 | 1,999
Reported Value Measurement | States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 3,975 | 4,824
Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,192 | 1,395
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 0 | 0
Short-term debt, Fair Value | 0 |
Long-term debt, Fair Value | 0 | 0
Trust preferred securities | 0 | 0
Total liabilities | 0 | 0
Level 1 | US Treasury and Government [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,192 | 1,395
Level 1 | Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 1 | Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 1 | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 1 | States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 9,455 | 11,115
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,406 | 1,405
Short-term debt, Fair Value | 1,019 |
Long-term debt, Fair Value | 16,848 | 17,487
Trust preferred securities | 460 | 473
Total liabilities | 19,733 | 19,365
Level 2 | US Treasury and Government [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 52 | 57
Level 2 | Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,262 | 1,405
Level 2 | Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 2,201 | 2,438
Level 2 | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,803 | 2,146
Level 2 | States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 4,137 | 5,069
Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, 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 |
Long-term debt, Fair Value | 0 | 0
Trust preferred securities | 0 | 0
Total liabilities | 0 | 0
Level 3 | US Treasury and Government [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 3 | Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 3 | Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 3 | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 3 | States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | $ 0 | $ 0

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