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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