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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, 2022
Dec. 31, 2021
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value $ 9,888 $ 10,647
Debt Securities, Held-to-maturity 9,852 10,153
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,406 1,406
Short-term debt 1,474 999
Long-term debt 14,585 15,169
Total liabilities 141,292 140,340
Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,126 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 8,762 9,455
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,406 1,406
Short-term Debt, Fair Value 1,484 1,019
Long-term Debt, Fair Value 14,702 16,848
Trust preferred securities 425 460
Total liabilities 18,017 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 1,406 1,406
Short-term Debt, Fair Value 1,484 1,019
Long-term Debt, Fair Value 14,702 16,848
Trust preferred securities 425 460
Total liabilities 18,017 19,733
Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 9,818 10,118
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,406 1,406
Short-term debt 1,474 999
Long-term debt 14,585 15,169
Trust preferred securities 308 308
Total liabilities 17,773 17,882
U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,174 1,244
Debt Securities, Held-to-maturity 1,180 1,213
U.S. Treasury / Agency | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,126 1,192
U.S. Treasury / Agency | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 48 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 1,180 1,213
Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,191 1,262
Debt Securities, Held-to-maturity 1,185 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 1,191 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 1,180 1,196
Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,935 2,201
Debt Securities, Held-to-maturity 1,913 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 1,935 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 1,885 2,004
Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,684 1,803
Debt Securities, Held-to-maturity 1,689 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 1,684 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 1,689 1,730
Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 3,904 4,137
Debt Securities, Held-to-maturity 3,885 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 3,904 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 $ 3,884 $ 3,975