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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Carried at Cost or Amortized Cost (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments $ 4,070 $ 3,842
Assets:    
Securities held to maturity, fixed maturities, amortized cost 19,063 22,008
Held to maturity, fixed maturity securities, fair value 21,210 26,869
Commercial mortgage and other loans 13,496 11,786
Commercial mortgage and other loans, fair value 13,212 11,996
Other investments, carried at amortized cost 34 [1] 22 [2]
Other investments, carried at amortized cost, fair value 34 [1] 22 [2]
Total financial instruments, assets, not carried at fair value 32,586 33,808
Assets, fair value disclosure, financial instruments, carried at cost 34,456 38,887
Liabilities:    
Other policyholders' funds 6,123 7,072
Other policyholders' funds fair value disclosure 6,022 6,957
Notes payable 7,295 7,839
Notes payable, fair value disclosure 6,826 8,539
Total financial instrument liabilities not carried at fair value 13,418 14,911
Liabilities fair value disclosure financial instruments carried at cost 12,848 15,496
Government and agencies    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 18,267 21,086
Held to maturity, fixed maturity securities, fair value 20,312 25,699
Municipalities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 287 335
Held to maturity, fixed maturity securities, fair value 335 436
Public utilities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 37 43
Held to maturity, fixed maturity securities, fair value 41 55
Sovereign and supranational    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 446 514
Held to maturity, fixed maturity securities, fair value 500 650
Other corporate    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 19 22
Held to maturity, fixed maturity securities, fair value 22 29
Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 214 236
Equity method investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 2,290 1,858
Level 1    
Assets:    
Held to maturity, fixed maturity securities, fair value 20,132 25,469
Commercial mortgage and other loans, fair value 0 0
Other investments, carried at amortized cost, fair value 0 [1] 0 [2]
Assets, fair value disclosure, financial instruments, carried at cost 20,132 25,469
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable, fair value disclosure 0 0
Liabilities fair value disclosure financial instruments carried at cost 0 0
Level 1 | Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, fair value 20,132 25,469
Level 1 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Level 1 | Public utilities    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Level 1 | Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Level 1 | Other corporate    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Level 2    
Assets:    
Held to maturity, fixed maturity securities, fair value 1,078 1,400
Commercial mortgage and other loans, fair value 0 0
Other investments, carried at amortized cost, fair value 34 [1] 22 [2]
Assets, fair value disclosure, financial instruments, carried at cost 1,112 1,422
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable, fair value disclosure 6,024 8,280
Liabilities fair value disclosure financial instruments carried at cost 6,024 8,280
Level 2 | Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, fair value 180 230
Level 2 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 335 436
Level 2 | Public utilities    
Assets:    
Held to maturity, fixed maturity securities, fair value 41 55
Level 2 | Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, fair value 500 650
Level 2 | Other corporate    
Assets:    
Held to maturity, fixed maturity securities, fair value 22 29
Level 3    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Commercial mortgage and other loans, fair value 13,212 11,996
Other investments, carried at amortized cost, fair value 0 [1] 0 [2]
Assets, fair value disclosure, financial instruments, carried at cost 13,212 11,996
Liabilities:    
Other policyholders' funds fair value disclosure 6,022 6,957
Notes payable, fair value disclosure 802 259
Liabilities fair value disclosure financial instruments carried at cost 6,824 7,216
Level 3 | Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Level 3 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Level 3 | Public utilities    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Level 3 | Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Level 3 | Other corporate    
Assets:    
Held to maturity, fixed maturity securities, fair value $ 0 $ 0
[1] Excludes policy loans of $214 and equity method investments of $2,290 at carrying value
[2] Excludes policy loans of $236 and equity method investments of $1,858, at carrying value