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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

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