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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, 2021
Dec. 31, 2020
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value $ 11,752 $ 12,510
Debt Securities, Held-to-maturity 11,175 11,697
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,405 1,405
Long-term debt 14,879 14,948
Total liabilities 132,901 131,333
Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,144 1,395
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 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 10,608 11,115
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,405 1,405
Long-term Debt, Fair Value 16,408 17,487
Trust preferred securities 470 473
Total liabilities 18,283 19,365
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
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 1,405 1,405
Long-term Debt, Fair Value 16,408 17,487
Trust preferred securities 470 473
Total liabilities 18,283 19,365
Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 11,132 11,653
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,405 1,405
Trust preferred securities 308 308
Long-term debt 14,879 14,948
Total liabilities 16,592 16,661
U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,197 1,452
Debt Securities, Held-to-maturity 1,158 1,392
U.S. Treasury / Agency | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,144 1,395
U.S. Treasury / Agency | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 53 57
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 1,158 1,392
Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,351 1,405
Debt Securities, Held-to-maturity 1,276 1,295
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 1,351 1,405
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 1,270 1,288
Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 2,311 2,438
Debt Securities, Held-to-maturity 2,163 2,185
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 2,311 2,438
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 2,128 2,150
Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,997 2,146
Debt Securities, Held-to-maturity 1,888 2,000
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 1,997 2,146
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 1,887 1,999
Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 4,896 5,069
Debt Securities, Held-to-maturity 4,690 4,825
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 4,896 5,069
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 $ 4,689 $ 4,824