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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, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments $ 3,842 $ 2,429
Assets:    
Securities held to maturity, fixed maturities, amortized cost 22,008 24,474
Held to maturity, fixed maturity securities, fair value 26,869 30,399
Commercial mortgage and other loans 11,786 10,554
Commercial mortgage and other loans, fair value 11,996 10,655
Other investments, carried at amortized cost 22 [1] 26 [2]
Other investments, carried at amortized cost, fair value 22 [1] 26 [2]
Total financial instruments, assets, not carried at fair value 33,808 35,044
Assets, fair value disclosure, financial instruments, carried at cost 38,887 41,080
Liabilities:    
Other policyholders' funds 7,072 7,824
Other policyholders' funds fair value disclosure 6,957 7,709
Notes payable 7,839 7,745
Notes payable, fair value disclosure 8,539 8,684
Total financial instrument liabilities not carried at fair value 14,911 15,569
Liabilities fair value disclosure financial instruments carried at cost 15,496 16,393
Government and agencies    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 21,086 23,445
Held to maturity, fixed maturity securities, fair value 25,699 29,070
Municipalities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 335 377
Held to maturity, fixed maturity securities, fair value 436 499
Public utilities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 43 47
Held to maturity, fixed maturity securities, fair value 55 61
Sovereign and supranational    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 514 571
Held to maturity, fixed maturity securities, fair value 650 736
Other corporate    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 22 24
Held to maturity, fixed maturity securities, fair value 29 33
Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 236 260
Equity method investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 1,858 1,004
Level 1    
Assets:    
Held to maturity, fixed maturity securities, fair value 25,469 28,810
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 25,469 28,810
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 25,469 28,810
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 1,400 1,589
Commercial mortgage and other loans, fair value 0 0
Other investments, carried at amortized cost, fair value 22 [1] 26 [2]
Assets, fair value disclosure, financial instruments, carried at cost 1,422 1,615
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable, fair value disclosure 8,280 8,396
Liabilities fair value disclosure financial instruments carried at cost 8,280 8,396
Level 2 | Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, fair value 230 260
Level 2 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 436 499
Level 2 | Public utilities    
Assets:    
Held to maturity, fixed maturity securities, fair value 55 61
Level 2 | Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, fair value 650 736
Level 2 | Other corporate    
Assets:    
Held to maturity, fixed maturity securities, fair value 29 33
Level 3    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Commercial mortgage and other loans, fair value 11,996 10,655
Other investments, carried at amortized cost, fair value 0 [1] 0 [2]
Assets, fair value disclosure, financial instruments, carried at cost 11,996 10,655
Liabilities:    
Other policyholders' funds fair value disclosure 6,957 7,709
Notes payable, fair value disclosure 259 288
Liabilities fair value disclosure financial instruments carried at cost 7,216 7,997
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 $236 and equity method investments of $1,858, at carrying value
[2] Excludes policy loans of $260 and equity method investments of $1,004, at carrying value