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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, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | $ 13,284 | $ 14,474
Debt Securities, Held-to-maturity | 13,563 | 14,335
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,414 | 1,408
Short-term debt | 500 | 1,013
Long-term debt | 12,149 | 11,556
Trust preferred securities | 308 | 308
Total liabilities | 116,750 | 115,850
U.S. Treasury and agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,093 | 915
Debt Securities, Held-to-maturity | 1,112 | 908
Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,586 | 1,757
Debt Securities, Held-to-maturity | 1,601 | 1,738
Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 2,578 | 3,219
Debt Securities, Held-to-maturity | 2,658 | 3,159
Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 2,503 | 2,742
Debt Securities, Held-to-maturity | 2,574 | 2,724
States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 5,524 | 5,841
Debt Securities, Held-to-maturity | 5,618 | 5,806
Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,039 | 857
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 1 | U.S. Treasury and agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,039 | 857
Level 1 | Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 1 | Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 1 | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 1 | States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 12,214 | 13,582
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,414 | 1,408
Short-term Debt, Fair Value | 510 | 1,013
Long-term Debt, Fair Value | 12,224 | 12,332
Trust preferred securities | 432 | 468
Total liabilities | 14,580 | 15,221
Level 2 | U.S. Treasury and agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 54 | 58
Level 2 | Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,586 | 1,757
Level 2 | Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 2,547 | 3,184
Level 2 | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 2,503 | 2,742
Level 2 | States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 5,524 | 5,841
Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 31 | 35
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 3 | U.S. Treasury and agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 3 | Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 3 | Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 31 | 35
Level 3 | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Level 3 | States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Estimate of Fair Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 13,284 | 14,474
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,414 | 1,408
Short-term Debt, Fair Value | 510 | 1,013
Long-term Debt, Fair Value | 12,224 | 12,332
Trust preferred securities | 432 | 468
Total liabilities | 14,580 | 15,221
Estimate of Fair Value Measurement [Member] | U.S. Treasury and agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,093 | 915
Estimate of Fair Value Measurement [Member] | Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 1,586 | 1,757
Estimate of Fair Value Measurement [Member] | Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 2,578 | 3,219
Estimate of Fair Value Measurement [Member] | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 2,503 | 2,742
Estimate of Fair Value Measurement [Member] | States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity, Fair Value | 5,524 | 5,841
Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 13,563 | 14,335
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,414 | 1,408
Short-term debt | 500 | 1,013
Long-term debt | 12,149 | 11,556
Trust preferred securities | 308 | 308
Total liabilities | 14,371 | 14,285
Reported Value Measurement [Member] | U.S. Treasury and agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 1,112 | 908
Reported Value Measurement [Member] | Foreign |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 1,601 | 1,738
Reported Value Measurement [Member] | Corporate securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 2,658 | 3,159
Reported Value Measurement [Member] | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | 2,574 | 2,724
Reported Value Measurement [Member] | States, municipalities, and political subdivisions |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Debt Securities, Held-to-maturity | $ 5,618 | $ 5,806

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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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=6879938&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=6876686&loc=d3e534808-122878 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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