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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
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments [1] $ 7,009 $ 3,402
Assets:    
Securities held to maturity, fixed maturities, amortized cost 30,421 31,430
Held to maturity, fixed maturity securities, fair value 36,250 38,072
Other investments carried at amortized cost 6,542 [2] 3,017 [3]
Other investments carried at amortized cost, fair value 6,519 [2] 3,002 [3]
Total financial instruments assets not carried at fair value 36,963 34,447
Assets fair value disclosure financial instruments carried at cost 42,769 41,074
Liabilities:    
Other policyholder funds 6,974 6,939
Other policyholders' funds fair value disclosure 6,896 6,841
Notes payable 5,264 5,267
Notes payable fair value disclosure 5,329 5,553
Total financial instrument liabilities not carried at fair value 12,238 12,206
Liabilities fair value disclosure financial instruments carried at cost 12,225 12,394
Government and agencies    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 21,224 21,331
Held to maturity, fixed maturity securities, fair value 25,876 26,491
Municipalities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 353 357
Held to maturity, fixed maturity securities, fair value 450 462
Mortgage- and asset-backed securities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 14 26
Held to maturity, fixed maturity securities, fair value 15 27
Public utilities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 3,150 3,300
Held to maturity, fixed maturity securities, fair value 3,451 3,698
Sovereign and supranational    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 1,516 1,523
Held to maturity, fixed maturity securities, fair value 1,792 1,835
Banks/financial institutions    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 1,491 2,206
Held to maturity, fixed maturity securities, fair value 1,643 2,387
Other corporate    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 2,673 2,687
Held to maturity, fixed maturity securities, fair value 3,023 3,172
Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 223 210
Equity method investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 242 118
Level 1    
Assets:    
Held to maturity, fixed maturity securities, fair value 25,868 26,491
Other investments carried at amortized cost, fair value 0 [2] 0 [3]
Assets fair value disclosure financial instruments carried at cost 25,868 26,491
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 25,868 26,491
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 10,367 11,562
Other investments carried at amortized cost, fair value 25 [2] 15 [3]
Assets fair value disclosure financial instruments carried at cost 10,392 11,577
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable fair value disclosure 5,066 5,288
Liabilities fair value disclosure financial instruments carried at cost 5,066 5,288
Level 2 | Government and agencies    
Assets:    
Held to maturity, fixed maturity securities, fair value 8 0
Level 2 | Municipalities    
Assets:    
Held to maturity, fixed maturity securities, fair value 450 462
Level 2 | Mortgage- and asset-backed securities    
Assets:    
Held to maturity, fixed maturity securities, fair value 0 8
Level 2 | Public utilities    
Assets:    
Held to maturity, fixed maturity securities, fair value 3,451 3,698
Level 2 | Sovereign and supranational    
Assets:    
Held to maturity, fixed maturity securities, fair value 1,792 1,835
Level 2 | Banks/financial institutions    
Assets:    
Held to maturity, fixed maturity securities, fair value 1,643 2,387
Level 2 | Other corporate    
Assets:    
Held to maturity, fixed maturity securities, fair value 3,023 3,172
Level 3    
Assets:    
Held to maturity, fixed maturity securities, fair value 15 19
Other investments carried at amortized cost, fair value 6,494 [2] 2,987 [3]
Assets fair value disclosure financial instruments carried at cost 6,509 3,006
Liabilities:    
Other policyholders' funds fair value disclosure 6,896 6,841
Notes payable fair value disclosure 263 265
Liabilities fair value disclosure financial instruments carried at cost 7,159 7,106
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 15 19
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] Includes $5,388 in 2018 and $2,341 in 2017 of loan receivables and limited partnerships from consolidated variable interest entities
[2] Excludes policy loans of $223 and equity method investments of $242, at carrying value
[3] Excludes policy loans of $210 and equity method investments of $118, at carrying value