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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | $ 11,343 | $ 12,510
Debt Securities, Held-to-maturity | 10,710 | 11,697
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,405 | 1,405
Long-term debt | 14,954 | 14,948
Total liabilities | 137,112 | 131,333
Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,029 | 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 | 10,314 | 11,115
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,405 | 1,405
Long-term Debt, Fair Value | 16,822 | 17,487
Trust preferred securities | 467 | 473
Total liabilities | 18,694 | 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 | 16,822 | 17,487
Trust preferred securities | 467 | 473
Total liabilities | 18,694 | 19,365
Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 10,673 | 11,653
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,405 | 1,405
Trust preferred securities | 308 | 308
Long-term debt | 14,954 | 14,948
Total liabilities | 16,667 | 16,661
U.S. Treasury / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,082 | 1,452
Debt Securities, Held-to-maturity | 1,041 | 1,392
U.S. Treasury / Agency | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,029 | 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 | 1,041 | 1,392
Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,366 | 1,405
Debt Securities, Held-to-maturity | 1,285 | 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 | 1,366 | 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 | 1,280 | 1,288
Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 2,314 | 2,438
Debt Securities, Held-to-maturity | 2,117 | 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 | 2,314 | 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 | 2,087 | 2,150
Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 1,892 | 2,146
Debt Securities, Held-to-maturity | 1,782 | 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 | 1,892 | 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 | 1,781 | 1,999
Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held to maturity, Fair Value | 4,689 | 5,069
Debt Securities, Held-to-maturity | 4,485 | 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 | 4,689 | 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 | $ 4,484 | $ 4,824

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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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