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Fair Value Measurements (Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | $ 8,439 | $ 10,647
Fixed maturities, held-to-maturity | 8,882 | 10,153
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,419 | 1,406
Short-term debt | 475 | 999
Long-term debt | 14,402 | 15,169
Liabilities | 148,604 | 140,340
Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity | 8,848 | 10,118
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,419 | 1,406
Short-term debt | 475 | 999
Long-term debt | 14,402 | 15,169
Trust preferred securities | 308 | 308
Liabilities | 16,604 | 17,882
Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,299 | 1,192
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
Liabilities | 0 | 0
Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 7,140 | 9,455
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,419 | 1,406
Short-term debt, Fair Value | 473 | 1,019
Long-term debt, Fair Value | 12,495 | 16,848
Trust preferred securities | 383 | 460
Liabilities | 14,770 | 19,733
Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
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
Liabilities | 0 | 0
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 8,439 | 10,647
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Repurchase agreements | 1,419 | 1,406
Short-term debt, Fair Value | 473 | 1,019
Long-term debt, Fair Value | 12,495 | 16,848
Trust preferred securities | 383 | 460
Liabilities | 14,770 | 19,733
U.S. Treasury / Agency |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,370 | 1,244
Fixed maturities, held-to-maturity | 1,417 | 1,213
U.S. Treasury / Agency | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity | 1,417 | 1,213
U.S. Treasury / Agency | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,299 | 1,192
U.S. Treasury / Agency | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 71 | 52
U.S. Treasury / Agency | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
U.S. Treasury / Agency | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,370 | 1,244
Non-U.S. |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,054 | 1,262
Fixed maturities, held-to-maturity | 1,140 | 1,201
Non-U.S. | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity | 1,136 | 1,196
Non-U.S. | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
Non-U.S. | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,054 | 1,262
Non-U.S. | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
Non-U.S. | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,054 | 1,262
Corporate and asset-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,580 | 2,201
Fixed maturities, held-to-maturity | 1,733 | 2,032
Corporate and asset-backed securities | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity | 1,705 | 2,004
Corporate and asset-backed securities | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
Corporate and asset-backed securities | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,580 | 2,201
Corporate and asset-backed securities | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
Corporate and asset-backed securities | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,580 | 2,201
Mortgage-backed securities |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,351 | 1,803
Fixed maturities, held-to-maturity | 1,456 | 1,731
Mortgage-backed securities | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity | 1,455 | 1,730
Mortgage-backed securities | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
Mortgage-backed securities | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,351 | 1,803
Mortgage-backed securities | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
Mortgage-backed securities | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 1,351 | 1,803
Municipal |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 3,084 | 4,137
Fixed maturities, held-to-maturity | 3,136 | 3,976
Municipal | Cost |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity | 3,135 | 3,975
Municipal | Level 1 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
Municipal | Level 2 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 3,084 | 4,137
Municipal | Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | 0 | 0
Municipal | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Portion at Other than Fair Value Measurement |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Fixed maturities, held-to-maturity, fair value | $ 3,084 | $ 4,137

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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 https://asc.fasb.org/extlink&oid=126734703&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 https://asc.fasb.org/extlink&oid=126897435&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. 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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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