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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value $ 11,119 $ 12,510
Debt Securities, Held-to-maturity 10,550 11,697
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,406 1,405
Long-term debt 14,823 14,948
Total liabilities 139,736 131,333
Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,195 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 9,924 11,115
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,406 1,405
Long-term Debt, Fair Value 16,648 17,487
Trust preferred securities 465 473
Total liabilities 18,519 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 1,406 1,405
Long-term Debt, Fair Value 16,648 17,487
Trust preferred securities 465 473
Total liabilities 18,519 19,365
Reported Value Measurement [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Debt Securities, Held-to-maturity 10,515 11,653
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Repurchase agreements 1,406 1,405
Trust preferred securities 308 308
Long-term debt 14,823 14,948
Total liabilities 16,537 16,661
U.S. Treasury / Agency    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,247 1,452
Debt Securities, Held-to-maturity 1,209 1,392
U.S. Treasury / Agency | Level 1    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,195 1,395
U.S. Treasury / Agency | Level 2    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 52 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 1,209 1,392
Non-U.S.    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,330 1,405
Debt Securities, Held-to-maturity 1,259 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 1,330 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 1,254 1,288
Corporate and asset-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 2,260 2,438
Debt Securities, Held-to-maturity 2,079 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 2,260 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 2,051 2,150
Mortgage-backed securities    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 1,868 2,146
Debt Securities, Held-to-maturity 1,771 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 1,868 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 1,770 1,999
Municipal    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Held to maturity, Fair Value 4,414 5,069
Debt Securities, Held-to-maturity 4,232 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 4,414 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 $ 4,231 $ 4,824