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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
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments $ 5,241 $ 4,070
Assets:    
Held to maturity, fixed maturity securities, amortized cost 18,942 19,063
Held to maturity, fixed maturity securities, fair value 21,616 21,210
Commercial mortgage and other loans 13,328  
Commercial mortgage and other loans, fair value 13,052 13,212
Other investments carried at amortized cost 34 [1] 34 [2]
Other investments carried at amortized cost, fair value 34 [1] 34 [2]
Total financial instruments assets not carried at fair value 32,298 32,586
Assets fair value disclosure financial instruments carried at cost 34,702 34,456
Liabilities:    
Other policyholders’ funds 6,668 6,643
Other policyholders' funds fair value disclosure 6,569 6,543
Notes payable 7,270 7,295
Notes payable, fair value disclosure 6,972 6,826
Total financial instrument liabilities not carried at fair value 13,938 13,938
Liabilities fair value disclosure financial instruments carried at cost 13,541 13,369
Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, amortized cost 18,152 18,267
Held to maturity, fixed maturity securities, fair value 20,700 20,312
Municipalities    
Assets:    
Held to maturity, fixed maturity securities, amortized cost 285 287
Held to maturity, fixed maturity securities, fair value 341 335
Public utilities    
Assets:    
Held to maturity, fixed maturity securities, amortized cost 37 37
Held to maturity, fixed maturity securities, fair value 42 41
Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, amortized cost 443 446
Held to maturity, fixed maturity securities, fair value 510 500
Other corporate    
Assets:    
Held to maturity, fixed maturity securities, amortized cost 19 19
Held to maturity, fixed maturity securities, fair value 23 22
Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 214 214
Equity method investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 2,432 2,290
Level 1    
Assets:    
Held to maturity, fixed maturity securities, fair value 20,517 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 20,517 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 20,517 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 1,099 1,078
Commercial mortgage and other loans, fair value 0 0
Other investments carried at amortized cost, fair value 34 [1] 34 [2]
Assets fair value disclosure financial instruments carried at cost 1,133 1,112
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable, fair value disclosure 6,175 6,024
Liabilities fair value disclosure financial instruments carried at cost 6,175 6,024
Level 2 | Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, fair value 183 180
Level 2 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 341 335
Level 2 | Public utilities    
Assets:    
Held to maturity, fixed maturity securities, fair value 42 41
Level 2 | Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, fair value 510 500
Level 2 | Other corporate    
Assets:    
Held to maturity, fixed maturity securities, fair value 23 22
Level 3    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Commercial mortgage and other loans, fair value 13,052 13,212
Other investments carried at amortized cost, fair value 0 [1] 0 [2]
Assets fair value disclosure financial instruments carried at cost 13,052 13,212
Liabilities:    
Other policyholders' funds fair value disclosure 6,569 6,543
Notes payable, fair value disclosure 797 802
Liabilities fair value disclosure financial instruments carried at cost 7,366 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 $214 and equity method investments of $2,432, at carrying value
[2] Excludes policy loans of $214 and equity method investments of $2,290, at carrying valuePrior-year amounts have been adjusted for the adoption of accounting guidance on January 1, 2023 related to accounting for long-duration insurance contracts.