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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
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments $ 5,491 $ 4,070
Assets:    
Amortized Cost 17,441 19,063
Held to maturity, fixed maturity securities, fair value 19,938 21,210
Commercial mortgage and other loans 13,346  
Commercial mortgage and other loans, fair value 13,014 13,212
Other investments carried at amortized cost 32 [1] 34 [2]
Other investments carried at amortized cost, fair value 32 [1] 34 [2]
Total financial instruments assets not carried at fair value 30,814 32,586
Assets fair value disclosure financial instruments carried at cost 32,984 34,456
Liabilities:    
Other policyholders’ funds 6,115 6,643
Other policyholders' funds fair value disclosure 6,020 6,543
Notes payable 6,941 7,295
Notes payable, fair value disclosure 6,622 6,826
Total financial instrument liabilities not carried at fair value 13,056 13,938
Liabilities fair value disclosure financial instruments carried at cost 12,642 13,369
Government and agencies    
Assets:    
Amortized Cost 16,715 18,267
Held to maturity, fixed maturity securities, fair value 19,102 20,312
Municipalities    
Assets:    
Amortized Cost 261 287
Held to maturity, fixed maturity securities, fair value 314 335
Public utilities    
Assets:    
Amortized Cost 35 37
Held to maturity, fixed maturity securities, fair value 39 41
Sovereign and supranational    
Assets:    
Amortized Cost 408 446
Held to maturity, fixed maturity securities, fair value 462 500
Other corporate    
Assets:    
Amortized Cost 17 19
Held to maturity, fixed maturity securities, fair value 21 22
Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 202 214
Equity method investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 2,551 2,290
Level 1    
Assets:    
Held to maturity, fixed maturity securities, fair value 18,932 20,132
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 18,932 20,132
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 18,932 20,132
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 1,006 1,078
Commercial mortgage and other loans, fair value 0 0
Other investments carried at amortized cost, fair value 32 [1] 34 [2]
Assets fair value disclosure financial instruments carried at cost 1,038 1,112
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable, fair value disclosure 5,887 6,024
Liabilities fair value disclosure financial instruments carried at cost 5,887 6,024
Level 2 | Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, fair value 170 180
Level 2 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 314 335
Level 2 | Public utilities    
Assets:    
Held to maturity, fixed maturity securities, fair value 39 41
Level 2 | Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, fair value 462 500
Level 2 | Other corporate    
Assets:    
Held to maturity, fixed maturity securities, fair value 21 22
Level 3    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Commercial mortgage and other loans, fair value 13,014 13,212
Other investments carried at amortized cost, fair value 0 [1] 0 [2]
Assets fair value disclosure financial instruments carried at cost 13,014 13,212
Liabilities:    
Other policyholders' funds fair value disclosure 6,020 6,543
Notes payable, fair value disclosure 735 802
Liabilities fair value disclosure financial instruments carried at cost 6,755 7,345
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 $202 and equity method investments of $2,551, at carrying value
[2] Excludes policy loans of $214 and equity method investments of $2,290, at carrying value