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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, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments $ 3,258 $ 2,429
Assets:    
Securities held to maturity, fixed maturities, amortized cost 22,899 24,474
Held to maturity, fixed maturity securities, fair value 28,154 30,399
Commercial mortgage and other loans 11,332 10,554
Commercial mortgage and other loans, fair value 11,468 10,655
Other investments carried at amortized cost 19 [1] 26 [2]
Other investments carried at amortized cost, fair value 19 [1] 26 [2]
Total financial instruments assets not carried at fair value 34,242 35,044
Assets fair value disclosure financial instruments carried at cost 39,641 41,080
Liabilities:    
Other policyholders’ funds 7,368 7,824
Other policyholders' funds fair value disclosure 7,257 7,709
Notes payable 7,979 7,745
Notes payable, fair value disclosure 8,732 8,684
Total financial instrument liabilities not carried at fair value 15,347 15,569
Liabilities fair value disclosure financial instruments carried at cost 15,989 16,393
Government and agencies    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 21,938 23,445
Held to maturity, fixed maturity securities, fair value 26,924 29,070
Municipalities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 351 377
Held to maturity, fixed maturity securities, fair value 461 499
Public utilities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 45 47
Held to maturity, fixed maturity securities, fair value 58 61
Sovereign and supranational    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 534 571
Held to maturity, fixed maturity securities, fair value 681 736
Other corporate    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 23 24
Held to maturity, fixed maturity securities, fair value 30 33
Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 243 260
Equity method investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 1,329 1,004
Level 1    
Assets:    
Held to maturity, fixed maturity securities, fair value 26,683 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 26,683 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 26,683 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 1,471 1,589
Commercial mortgage and other loans, fair value 0 0
Other investments carried at amortized cost, fair value 19 [1] 26 [2]
Assets fair value disclosure financial instruments carried at cost 1,490 1,615
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable, fair value disclosure 8,462 8,396
Liabilities fair value disclosure financial instruments carried at cost 8,462 8,396
Level 2 | Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, fair value 241 260
Level 2 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 461 499
Level 2 | Public utilities    
Assets:    
Held to maturity, fixed maturity securities, fair value 58 61
Level 2 | Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, fair value 681 736
Level 2 | Other corporate    
Assets:    
Held to maturity, fixed maturity securities, fair value 30 33
Level 3    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Commercial mortgage and other loans, fair value 11,468 10,655
Other investments carried at amortized cost, fair value 0 [1] 0 [2]
Assets fair value disclosure financial instruments carried at cost 11,468 10,655
Liabilities:    
Other policyholders' funds fair value disclosure 7,257 7,709
Notes payable, fair value disclosure 270 288
Liabilities fair value disclosure financial instruments carried at cost 7,527 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 $243 and equity method investments of $1,329, at carrying value
[2] Excludes policy loans of $260 and equity method investments of $1,004, at carrying value