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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, 2020 | Dec. 31, 2019
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | $ 12,620 | $ 13,005
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) | 11,896 | 12,581
Debt securities, held to maturity, net carrying value | 11,845 |
Repurchase agreements | 1,409 | 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Short-term debt | 1,300 | 1,299
Long-term debt | 13,656 | 13,559
Total liabilities | 126,714 | 121,612
U.S. Treasury / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 1,315 | 1,347
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) | 1,242 | 1,318
Debt securities, held to maturity, net carrying value | 1,242 |
Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 1,370 | 1,485
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) | 1,278 | 1,423
Debt securities, held to maturity, net carrying value | 1,270 |
Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 2,428 | 2,468
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) | 2,232 | 2,349
Debt securities, held to maturity, net carrying value | 2,191 |
Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 2,331 | 2,396
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) | 2,189 | 2,331
Debt securities, held to maturity, net carrying value | 2,188 |
Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 5,176 | 5,309
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) | 4,955 | 5,160
Debt securities, held to maturity, net carrying value | 4,954 |
Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 1,257 | 1,292
Repurchase agreements | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
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 / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 1,257 | 1,292
Level 1 | Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 0
Level 1 | Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 0
Level 1 | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 0
Level 1 | Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 0
Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 11,363 | 11,681
Repurchase agreements | 1,409 | 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Short-term Debt, Fair Value | 1,309 | 1,307
Long-term Debt, Fair Value | 15,650 | 15,048
Trust preferred securities | 453 | 467
Total liabilities | 18,821 | 18,238
Level 2 | U.S. Treasury / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 58 | 55
Level 2 | Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 1,370 | 1,485
Level 2 | Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 2,428 | 2,436
Level 2 | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 2,331 | 2,396
Level 2 | Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 5,176 | 5,309
Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 32
Repurchase agreements | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
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 / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 0
Level 3 | Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 0
Level 3 | Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 32
Level 3 | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 0
Level 3 | Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 0 | 0
Estimate of Fair Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 12,620 | 13,005
Repurchase agreements | 1,409 | 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Short-term Debt, Fair Value | 1,309 | 1,307
Long-term Debt, Fair Value | 15,650 | 15,048
Trust preferred securities | 453 | 467
Total liabilities | 18,821 | 18,238
Estimate of Fair Value Measurement [Member] | U.S. Treasury / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 1,315 | 1,347
Estimate of Fair Value Measurement [Member] | Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 1,370 | 1,485
Estimate of Fair Value Measurement [Member] | Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 2,428 | 2,468
Estimate of Fair Value Measurement [Member] | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 2,331 | 2,396
Estimate of Fair Value Measurement [Member] | Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Held-to-maturity, Fair Value | 5,176 | 5,309
Reported Value Measurement [Member] |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) |  | 12,581
Debt securities, held to maturity, net carrying value | 11,845 |
Repurchase agreements | 1,409 | 1,416
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Short-term debt | 1,300 | 1,299
Long-term debt | 13,656 | 13,559
Trust preferred securities | 308 | 308
Total liabilities | 16,673 | 16,582
Reported Value Measurement [Member] | U.S. Treasury / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) |  | 1,318
Debt securities, held to maturity, net carrying value | 1,242 |
Reported Value Measurement [Member] | Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) |  | 1,423
Debt securities, held to maturity, net carrying value | 1,270 |
Reported Value Measurement [Member] | Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) |  | 2,349
Debt securities, held to maturity, net carrying value | 2,191 |
Reported Value Measurement [Member] | Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) |  | 2,331
Debt securities, held to maturity, net carrying value | 2,188 |
Reported Value Measurement [Member] | Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities held to maturity, at amortized cost, net of valuation allowance - $51 at June 30, 2020 (fair value – $12,620 and $13,005) |  | $ 5,160
Debt securities, held to maturity, net carrying value | $ 4,954 |

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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=118954083&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=118939692&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=119400593&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=119400593&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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