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Fair Value Measurements (Financial Instruments Measured At Fair Value on Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 85,220 $ 93,108
Equity securities, at fair value 827 4,782
Short-term investments 4,960 3,146
Other Investments 13,696 11,169
Securities lending collateral 1,523 1,831
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 12,355 10,108
Policy Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 343 243
Other Investments    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 47 51
U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,626 2,214
Debt Security, Government, Non-US [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,908 25,829
Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 36,955 39,063
Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 15,851 20,489
States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 3,880 5,513
Level 1 | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,100 1,680
Equity securities, at fair value 737 4,705
Short-term investments 3,108 1,744
Other Investments 552 [1] 286 [2]
Securities lending collateral 0 0
Investment derivative instruments, assets 82 58
Derivative Instruments in Hedges, Assets, at Fair Value 0  
Other Derivative Instruments Fair Value 33  
Separate Account Asset 5,101 5,461
Assets, Fair Value Disclosure 11,713 [1] 13,934 [2]
Investment derivative instruments, liability 139 166
Other derivative instruments, liability   16
Derivative Instruments in Hedges, Liabilities, at Fair Value 0  
Liabilities Related to Investment Contracts, Fair Value Disclosure 139 182
Level 1 | Fair Value, Recurring [Member] | Guaranteed Minimum Income Benefit    
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]
Level 1 | U.S. Treasury / Agency | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,100 1,680
Level 1 | Debt Security, Government, Non-US [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Level 1 | Corporate securities | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Level 1 | Mortgage-backed securities | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Level 1 | States, municipalities, and political subdivisions | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Level 2 | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 80,096 88,720
Equity securities, at fair value 0 0
Short-term investments 1,849 1,395
Other Investments 399 [1] 481 [2]
Securities lending collateral 1,523 1,831
Investment derivative instruments, assets 0 0
Derivative Instruments in Hedges, Assets, at Fair Value 17  
Other Derivative Instruments Fair Value 0  
Separate Account Asset 89 99
Assets, Fair Value Disclosure 83,973 [1] 92,526 [2]
Investment derivative instruments, liability 0 0
Other derivative instruments, liability   0
Derivative Instruments in Hedges, Liabilities, at Fair Value 53  
Liabilities Related to Investment Contracts, Fair Value Disclosure 53 0
Level 2 | Fair Value, Recurring [Member] | Guaranteed Minimum Income Benefit    
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]
Level 2 | U.S. Treasury / Agency | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 526 534
Level 2 | Debt Security, Government, Non-US [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,344 25,196
Level 2 | Corporate securities | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 34,506 37,014
Level 2 | Mortgage-backed securities | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 15,840 20,463
Level 2 | States, municipalities, and political subdivisions | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 3,880 5,513
Level 3 | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 3,024 2,708
Equity securities, at fair value 90 77
Short-term investments 3 7
Other Investments 0 [1] 0 [2]
Securities lending collateral 0 0
Investment derivative instruments, assets 0 0
Derivative Instruments in Hedges, Assets, at Fair Value 0  
Other Derivative Instruments Fair Value 0  
Separate Account Asset 0 0
Assets, Fair Value Disclosure 3,117 [1] 2,792 [2]
Investment derivative instruments, liability 0 0
Other derivative instruments, liability   0
Derivative Instruments in Hedges, Liabilities, at Fair Value 0  
Liabilities Related to Investment Contracts, Fair Value Disclosure 736 745
Level 3 | Fair Value, Recurring [Member] | Guaranteed Minimum Income Benefit    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 736 [3],[5] 745 [4]
Level 3 | U.S. Treasury / Agency | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Level 3 | Debt Security, Government, Non-US [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 564 633
Level 3 | Corporate securities | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,449 2,049
Level 3 | Mortgage-backed securities | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 11 26
Level 3 | States, municipalities, and political subdivisions | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 85,220 93,108
Equity securities, at fair value 827 4,782
Short-term investments 4,960 3,146
Other Investments 951 [1] 767 [2]
Securities lending collateral 1,523 1,831
Investment derivative instruments, assets 82 58
Derivative Instruments in Hedges, Assets, at Fair Value 17  
Other Derivative Instruments Fair Value 33  
Separate Account Asset 5,190 5,560
Assets, Fair Value Disclosure 98,803 [1] 109,252 [2]
Investment derivative instruments, liability 139 166
Other derivative instruments, liability   16
Derivative Instruments in Hedges, Liabilities, at Fair Value 53  
Liabilities Related to Investment Contracts, Fair Value Disclosure 928 927
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Fair Value, Recurring [Member] | Guaranteed Minimum Income Benefit    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 736 [3] 745 [4]
Fair Value, Inputs, Level 1, Level 2, and Level 3 | U.S. Treasury / Agency | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,626 2,214
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Debt Security, Government, Non-US [Member] | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,908 25,829
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Corporate securities | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 36,955 39,063
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Mortgage-backed securities | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 15,851 20,489
Fair Value, Inputs, Level 1, Level 2, and Level 3 | States, municipalities, and political subdivisions | Fair Value, Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 3,880 $ 5,513
[1] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $12,355 million, policy loans of $343 million and other investments of $47 million at December 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.
[5] The weighted average lapse and annuitization rates are determined by weighting each treaty's rates by the GLB contracts fair value.