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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | $ 93,108 |  | $ 90,699 |
Equity Securities, FV-NI | 4,782 |  | 4,027 |
Short-term investments | 3,146 |  | 4,345 |
Other Investments | 11,169 |  | 7,945 |
Securities lending collateral | 1,831 |  | 1,844 |
US Treasury and Government [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 2,214 |  | 2,670 |
Foreign |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 25,829 |  | 26,354 |
Corporate securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 39,063 |  | 36,331 |
Mortgage-backed securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 20,489 |  | 18,470 |
States, municipalities, and political subdivisions |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 5,513 |  | 6,874 |
Estimate of Fair Value Measurement [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Other Investments | 11,169 |  | 7,945 |
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Other Investments | 10,108 |  | 6,770 |
Other Investments |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Other Investments | 51 |  | 60 |
Policy Loans [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Other Investments | 243 |  | 233 |
Fair Value, Recurring [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 93,108 |  | 90,699 |
Equity Securities, FV-NI | 4,782 |  | 4,027 |
Short-term investments | 3,146 |  | 4,345 |
Other Investments | 767 |  | 882 |
Securities lending collateral | 1,831 |  | 1,844 |
Investment derivative instruments, assets | 58 |  | 35 |
Separate Account Asset | 5,560 |  | 4,388 |
Total assets measured at fair value | 109,252 |  | 106,220 | [1]
Investment derivative instruments, liability | 166 |  | 52 |
Other derivative instruments, liability | 16 |  | 17 |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 927 |  | 1,158 |
Fair Value, Recurring [Member] | US Treasury and Government [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 2,214 |  | 2,670 |
Fair Value, Recurring [Member] | Foreign |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 25,829 |  | 26,354 |
Fair Value, Recurring [Member] | Corporate securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 39,063 |  | 36,331 |
Fair Value, Recurring [Member] | Mortgage-backed securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 20,489 |  | 18,470 |
Fair Value, Recurring [Member] | States, municipalities, and political subdivisions |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 5,513 |  | 6,874 |
Fair Value, Recurring [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 1,680 |  | 2,148 |
Equity Securities, FV-NI | 4,705 |  | 3,954 |
Short-term investments | 1,744 |  | 2,866 |
Other Investments | 286 |  | 434 |
Securities lending collateral | 0 |  | 0 |
Investment derivative instruments, assets | 58 |  | 35 |
Separate Account Asset | 5,461 |  | 4,264 |
Total assets measured at fair value | 13,934 | [2] | 13,701 | [1]
Investment derivative instruments, liability | 166 |  | 52 |
Other derivative instruments, liability | 16 |  | 17 |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 182 |  | 69 |
Fair Value, Recurring [Member] | Level 1 | US Treasury and Government [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 1,680 |  | 2,148 |
Fair Value, Recurring [Member] | Level 1 | Foreign |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 0 |  | 0 |
Fair Value, Recurring [Member] | Level 1 | Corporate securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 0 |  | 0 |
Fair Value, Recurring [Member] | Level 1 | Mortgage-backed securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 0 |  | 0 |
Fair Value, Recurring [Member] | Level 1 | States, municipalities, and political subdivisions |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 0 |  | 0 |
Fair Value, Recurring [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 88,720 |  | 86,372 |
Equity Securities, FV-NI | 0 |  | 0 |
Short-term investments | 1,395 |  | 1,474 |
Other Investments | 481 |  | 438 |
Securities lending collateral | 1,831 |  | 1,844 |
Investment derivative instruments, assets | 0 |  | 0 |
Separate Account Asset | 99 |  | 124 |
Total assets measured at fair value | 92,526 | [2] | 90,252 | [1]
Investment derivative instruments, liability | 0 |  | 0 |
Other derivative instruments, liability | 0 |  | 0 |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 0 |  | 0 |
Fair Value, Recurring [Member] | Level 2 | US Treasury and Government [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 534 |  | 522 |
Fair Value, Recurring [Member] | Level 2 | Foreign |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 25,196 |  | 25,808 |
Fair Value, Recurring [Member] | Level 2 | Corporate securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 37,014 |  | 34,758 |
Fair Value, Recurring [Member] | Level 2 | Mortgage-backed securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 20,463 |  | 18,410 |
Fair Value, Recurring [Member] | Level 2 | States, municipalities, and political subdivisions |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 5,513 |  | 6,874 |
Fair Value, Recurring [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 2,708 |  | 2,179 |
Equity Securities, FV-NI | 77 |  | 73 |
Short-term investments | 7 |  | 5 |
Other Investments | 0 |  | 10 |
Securities lending collateral | 0 |  | 0 |
Investment derivative instruments, assets | 0 |  | 0 |
Separate Account Asset | 0 |  | 0 |
Total assets measured at fair value | 2,792 |  | 2,267 | [1]
Investment derivative instruments, liability | 0 |  | 0 |
Other derivative instruments, liability | 0 |  | 0 |
Liabilities Related to Investment Contracts, Fair Value Disclosure | 745 |  | 1,089 |
Fair Value, Recurring [Member] | Level 3 | US Treasury and Government [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 0 |  | 0 |
Fair Value, Recurring [Member] | Level 3 | Foreign |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 633 |  | 546 |
Fair Value, Recurring [Member] | Level 3 | Corporate securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 2,049 |  | 1,573 |
Fair Value, Recurring [Member] | Level 3 | Mortgage-backed securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 26 |  | 60 |
Fair Value, Recurring [Member] | Level 3 | States, municipalities, and political subdivisions |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Available for sale, Fair Value | 0 |  | 0 |
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross | 745 |  | 1,089 |
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross | 0 |  | 0 |
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross | 0 |  | 0 |
Guaranteed Minimum Income Benefit | Fair Value, Recurring [Member] | Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross | $ 745 |  | $ 1,089 |
[1] | Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $6,770 million, policy loans of $233 million and other investments of $60 million at December 31, 2020 measured using NAV as a practical expedient.(2)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[2] | Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $10,108 million, policy loans of $243 million and other investments of $51 million at December 31, 2021 measured using NAV as a practical expedient

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