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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 89,479 $ 93,108
Equity securities, at fair value 3,596 4,782
Short-term investments, at fair value (amortized cost – $3,408 and $3,147) 3,407 3,146
Other investments, at fair value 11,947 11,169
Securities lending collateral 1,800 1,831
U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,102 2,214
Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 24,784 25,829
Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 37,669 39,063
Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 19,805 20,489
Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 5,119 5,513
Fair Value, Recurring [Member] | Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,562 1,680
Equity securities, at fair value 3,514 4,705
Short-term investments, at fair value (amortized cost – $3,408 and $3,147) 1,954 1,744
Other investments, at fair value 253 [1] 286 [2]
Securities lending collateral 0 0
Investment derivative instruments, assets 163 58
Other Derivative Instruments Fair Value 3  
Separate Account Asset 5,468 5,461
Total assets measured at fair value 12,917 [1] 13,934 [2]
Investment derivative instruments, liabilities 212 166
Other derivative instruments, liability 63 16
Liabilities Related to Investment Contracts, Fair Value Disclosure 275 182
Fair Value, Recurring [Member] | Level 1 | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,562 1,680
Fair Value, Recurring [Member] | Level 1 | Non-U.S.    
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 and asset-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 | 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 | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 1 | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 0 [3] 0 [4]
Fair Value, Recurring [Member] | Level 2    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 85,050 88,720
Equity securities, at fair value 0 0
Short-term investments, at fair value (amortized cost – $3,408 and $3,147) 1,449 1,395
Other investments, at fair value 452 [1] 481 [2]
Securities lending collateral 1,800 1,831
Investment derivative instruments, assets 0 0
Other Derivative Instruments Fair Value 0  
Separate Account Asset 92 99
Total assets measured at fair value 88,843 [1] 92,526 [2]
Investment derivative instruments, liabilities 0 0
Other derivative instruments, liability 0 0
Liabilities Related to Investment Contracts, Fair Value Disclosure 0 0
Fair Value, Recurring [Member] | Level 2 | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 540 534
Fair Value, Recurring [Member] | Level 2 | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 24,166 25,196
Fair Value, Recurring [Member] | Level 2 | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 35,440 37,014
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 19,785 20,463
Fair Value, Recurring [Member] | Level 2 | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 5,119 5,513
Fair Value, Recurring [Member] | Level 2 | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 0 [3] 0 [4]
Fair Value, Recurring [Member] | Level 3    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,867 2,708
Equity securities, at fair value 82 77
Short-term investments, at fair value (amortized cost – $3,408 and $3,147) 4 7
Other investments, at fair value 0 [1] 0 [2]
Securities lending collateral 0 0
Investment derivative instruments, assets 0 0
Other Derivative Instruments Fair Value 0  
Separate Account Asset 0 0
Total assets measured at fair value 2,953 [1] 2,792 [2]
Investment derivative instruments, liabilities 0 0
Other derivative instruments, liability 0 0
Liabilities Related to Investment Contracts, Fair Value Disclosure 696 745
Fair Value, Recurring [Member] | Level 3 | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 3 | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 618 633
Fair Value, Recurring [Member] | Level 3 | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,229 2,049
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 20 26
Fair Value, Recurring [Member] | Level 3 | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Recurring [Member] | Level 3 | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 696 [3] 745 [4]
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 89,479 93,108
Equity securities, at fair value 3,596 4,782
Short-term investments, at fair value (amortized cost – $3,408 and $3,147) 3,407 3,146
Other investments, at fair value 705 [1] 767 [2]
Securities lending collateral 1,800 1,831
Investment derivative instruments, assets 163 58
Other Derivative Instruments Fair Value 3  
Separate Account Asset 5,560 5,560
Total assets measured at fair value 104,713 [1] 109,252 [2]
Investment derivative instruments, liabilities 212 166
Other derivative instruments, liability 63 16
Liabilities Related to Investment Contracts, Fair Value Disclosure 971 927
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,102 2,214
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 24,784 25,829
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 37,669 39,063
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 19,805 20,489
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 5,119 5,513
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 696 [3] 745 [4]
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value 10,947 10,108
Policy Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value 244 243
Other Investments [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value $ 51 $ 51
[1] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $10,947 million, policy loans of $244 million and other investments of $51 million at March 31, 2022 measured using NAV as a practical expedient.
[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.
[3] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[4] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.