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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, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments $ 1,238 $ 787
Assets:    
Securities held to maturity, fixed maturities, amortized cost 30,163 30,318
Held to maturity, fixed maturity securities, fair value 37,446 36,722
Commercial mortgage and other loans 7,180 6,919
Commercial mortgage and other loans, fair value 7,185 6,893
Other investments carried at amortized cost 25 [1] 26 [2]
Other investments carried at amortized cost, fair value 25 [1] 26 [2]
Total financial instruments assets not carried at fair value 37,368 37,263
Assets fair value disclosure financial instruments carried at cost 44,656 43,641
Liabilities:    
Other policyholders’ funds 7,185 7,146
Other policyholders' funds fair value disclosure 7,110 7,067
Notes payable 5,766 5,765
Notes payable, fair value disclosure 6,079 5,876
Total financial instrument liabilities not carried at fair value 12,951 12,911
Liabilities fair value disclosure financial instruments carried at cost 13,189 12,943
Government and agencies    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 21,961 21,712
Held to maturity, fixed maturity securities, fair value 27,979 27,038
Municipalities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 814 359
Held to maturity, fixed maturity securities, fair value 1,061 469
Mortgage- and asset-backed securities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 20 14
Held to maturity, fixed maturity securities, fair value 21 15
Public utilities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 2,728 2,727
Held to maturity, fixed maturity securities, fair value 3,068 2,973
Sovereign and supranational    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 1,154 1,551
Held to maturity, fixed maturity securities, fair value 1,332 1,840
Banks/financial institutions    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 949 1,445
Held to maturity, fixed maturity securities, fair value 1,039 1,583
Other corporate    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 2,537 2,510
Held to maturity, fixed maturity securities, fair value 2,946 2,804
Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 236 232
Equity method investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 434 377
Level 1    
Assets:    
Held to maturity, fixed maturity securities, fair value 27,629 27,030
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 27,629 27,030
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 27,629 27,030
Level 1 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 0
Level 1 | Mortgage- and asset-backed securities    
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 | Banks/financial institutions    
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 9,804 9,677
Commercial mortgage and other loans, fair value 0 0
Other investments carried at amortized cost, fair value 25 [1] 26 [2]
Assets fair value disclosure financial instruments carried at cost 9,829 9,703
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable, fair value disclosure 5,809 5,606
Liabilities fair value disclosure financial instruments carried at cost 5,809 5,606
Level 2 | Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, fair value 350 8
Level 2 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 1,061 469
Level 2 | Mortgage- and asset-backed securities    
Assets:    
Held to maturity, fixed maturity securities, fair value 8 0
Level 2 | Public utilities    
Assets:    
Held to maturity, fixed maturity securities, fair value 3,068 2,973
Level 2 | Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, fair value 1,332 1,840
Level 2 | Banks/financial institutions    
Assets:    
Held to maturity, fixed maturity securities, fair value 1,039 1,583
Level 2 | Other corporate    
Assets:    
Held to maturity, fixed maturity securities, fair value 2,946 2,804
Level 3    
Assets:    
Held to maturity, fixed maturity securities, fair value 13 15
Commercial mortgage and other loans, fair value 7,185 6,893
Other investments carried at amortized cost, fair value 0 [1] 0 [2]
Assets fair value disclosure financial instruments carried at cost 7,198 6,908
Liabilities:    
Other policyholders' funds fair value disclosure 7,110 7,067
Notes payable, fair value disclosure 270 270
Liabilities fair value disclosure financial instruments carried at cost 7,380 7,337
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 | Mortgage- and asset-backed securities    
Assets:    
Held to maturity, fixed maturity securities, fair value 13 15
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 | Banks/financial institutions    
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 $434, at carrying value
[2] Excludes policy loans of $232 and equity method investments of $377, at carrying value