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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value $ 13,240 $ 13,259
Debt Securities, Held-to-maturity 13,136 13,435
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,419 1,418
Short-term debt 509 509
Long-term debt 12,071 12,087
Trust preferred securities 308 308
Total liabilities 118,992 117,459
U.S. Treasury and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 1,152 1,182
Debt Securities, Held-to-maturity 1,144 1,185
Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 1,534 1,542
Debt Securities, Held-to-maturity 1,503 1,549
Corporate securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 2,539 2,508
Debt Securities, Held-to-maturity 2,543 2,601
Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 2,494 2,486
Debt Securities, Held-to-maturity 2,484 2,524
States, municipalities, and political subdivisions    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 5,521 5,541
Debt Securities, Held-to-maturity 5,462 5,576
Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 1,098 1,128
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 1 | U.S. Treasury and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 1,098 1,128
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 12,112 12,100
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,419 1,418
Short-term Debt, Fair Value 512 516
Long-term Debt, Fair Value 12,719 12,181
Trust preferred securities 425 409
Total liabilities 15,075 14,524
Level 2 | U.S. Treasury and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 54 54
Level 2 | Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 1,534 1,542
Level 2 | Corporate securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 2,509 2,477
Level 2 | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 2,494 2,486
Level 2 | States, municipalities, and political subdivisions    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 5,521 5,541
Level 3    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 30 31
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 3 | U.S. Treasury and agency    
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 30 31
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
Estimate of Fair Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 13,240 13,259
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,419 1,418
Short-term Debt, Fair Value 512 516
Long-term Debt, Fair Value 12,719 12,181
Trust preferred securities 425 409
Total liabilities 15,075 14,524
Estimate of Fair Value Measurement [Member] | U.S. Treasury and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 1,152 1,182
Estimate of Fair Value Measurement [Member] | Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 1,534 1,542
Estimate of Fair Value Measurement [Member] | Corporate securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 2,539 2,508
Estimate of Fair Value Measurement [Member] | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 2,494 2,486
Estimate of Fair Value Measurement [Member] | States, municipalities, and political subdivisions    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity, Fair Value 5,521 5,541
Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 13,136 13,435
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,419 1,418
Short-term debt 509 509
Long-term debt 12,071 12,087
Trust preferred securities 308 308
Total liabilities 14,307 14,322
Reported Value Measurement [Member] | U.S. Treasury and agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 1,144 1,185
Reported Value Measurement [Member] | Foreign    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 1,503 1,549
Reported Value Measurement [Member] | Corporate securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 2,543 2,601
Reported Value Measurement [Member] | Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 2,484 2,524
Reported Value Measurement [Member] | States, municipalities, and political subdivisions    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity $ 5,462 $ 5,576