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Fair value measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 83,741 $ 93,108
Equity securities, at fair value 844 4,782
Short-term investments, at fair value (amortized cost – $4,536 and $3,147) 4,534 3,146
Other investments, at fair value 13,645 11,169
Securities lending collateral 1,626 1,831
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value 12,392 10,108
Policy Loans    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value 316 243
Other Investments    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other investments, at fair value 50 51
U.S. Treasury / Agency    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,556 2,214
Non-U.S.    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 24,183 25,829
Corporate and asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 36,380 39,063
Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 16,235 20,489
Municipal    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 4,387 5,513
Level 1 | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,032 1,680
Equity securities, at fair value 761 4,705
Short-term investments, at fair value (amortized cost – $4,536 and $3,147) 2,782 1,744
Other investments, at fair value 506 [1] 286 [2]
Securities lending collateral 0 0
Investment derivative instruments, assets 129 58
Other Derivative Instruments Fair Value 109  
Derivative Instruments in Hedges, at Fair Value 0  
Separate Account Asset 4,810 5,461
Total assets measured at fair value 11,129 [1] 13,934 [2]
Investment derivative instruments, liabilities 306 166
Other derivative instruments, liability   16
Derivative Instruments in Hedges, Liabilities, at Fair Value 0  
Liabilities Related to Investment Contracts, Fair Value Disclosure 306 182
Level 1 | Fair Value, Recurring | 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]
Level 1 | U.S. Treasury / Agency | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,032 1,680
Level 1 | Non-U.S. | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Level 1 | Corporate and asset-backed securities | Fair Value, Recurring    
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    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Level 1 | Municipal | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Level 2 | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 78,888 88,720
Equity securities, at fair value 0 0
Short-term investments, at fair value (amortized cost – $4,536 and $3,147) 1,749 1,395
Other investments, at fair value 381 [1] 481 [2]
Securities lending collateral 1,626 1,831
Investment derivative instruments, assets 0 0
Other Derivative Instruments Fair Value 0  
Derivative Instruments in Hedges, at Fair Value 71  
Separate Account Asset 81 99
Total assets measured at fair value 82,796 [1] 92,526 [2]
Investment derivative instruments, liabilities 0 0
Other derivative instruments, liability   0
Derivative Instruments in Hedges, Liabilities, at Fair Value 101  
Liabilities Related to Investment Contracts, Fair Value Disclosure 101 0
Level 2 | Fair Value, Recurring | 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]
Level 2 | U.S. Treasury / Agency | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 524 534
Level 2 | Non-U.S. | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 23,677 25,196
Level 2 | Corporate and asset-backed securities | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 34,084 37,014
Level 2 | Mortgage-backed securities | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 16,216 20,463
Level 2 | Municipal | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 4,387 5,513
Level 3 | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,821 2,708
Equity securities, at fair value 83 77
Short-term investments, at fair value (amortized cost – $4,536 and $3,147) 3 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  
Derivative Instruments in Hedges, at Fair Value 0  
Separate Account Asset 0 0
Total assets measured at fair value 2,907 [1] 2,792 [2]
Investment derivative instruments, liabilities 0 0
Other derivative instruments, liability   0
Derivative Instruments in Hedges, Liabilities, at Fair Value 0  
Liabilities Related to Investment Contracts, Fair Value Disclosure 784 745
Level 3 | Fair Value, Recurring | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [5] 784 745 [4]
Level 3 | U.S. Treasury / Agency | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Level 3 | Non-U.S. | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 506 633
Level 3 | Corporate and asset-backed securities | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,296 2,049
Level 3 | Mortgage-backed securities | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 19 26
Level 3 | Municipal | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 0 0
Total Level 1, Level 2, and Level 3 | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 83,741 93,108
Equity securities, at fair value 844 4,782
Short-term investments, at fair value (amortized cost – $4,536 and $3,147) 4,534 3,146
Other investments, at fair value 887 [1] 767 [2]
Securities lending collateral 1,626 1,831
Investment derivative instruments, assets 129 58
Other Derivative Instruments Fair Value 109  
Derivative Instruments in Hedges, at Fair Value 71  
Separate Account Asset 4,891 5,560
Total assets measured at fair value 96,832 [1] 109,252 [2]
Investment derivative instruments, liabilities 306 166
Other derivative instruments, liability   16
Derivative Instruments in Hedges, Liabilities, at Fair Value 101  
Liabilities Related to Investment Contracts, Fair Value Disclosure 1,191 927
Total Level 1, Level 2, and Level 3 | Fair Value, Recurring | GLB    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 784 [3] 745 [4]
Total Level 1, Level 2, and Level 3 | U.S. Treasury / Agency | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 2,556 2,214
Total Level 1, Level 2, and Level 3 | Non-U.S. | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 24,183 25,829
Total Level 1, Level 2, and Level 3 | Corporate and asset-backed securities | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 36,380 39,063
Total Level 1, Level 2, and Level 3 | Mortgage-backed securities | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 16,235 20,489
Total Level 1, Level 2, and Level 3 | Municipal | Fair Value, Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 4,387 $ 5,513
[1] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $12,392 million, policy loans of $316 million, and other investments of $50 million at September 30, 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.