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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, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments [1] $ 3,402 $ 1,450
Assets:    
Securities held to maturity, fixed maturities, amortized cost 31,430 33,350
Securities held to maturity, fixed maturities, fair value 38,072 40,021
Other investments, carried at amortized cost 3,017 [2] 1,174
Other investments, carried at amortized cost, fair value 3,002 [2] 1,142
Total financial instruments, assets, not carried at fair value 34,447 34,524
Assets, fair value disclosure, financial instruments, carried at cost 41,074 41,163
Liabilities:    
Other policyholders' funds 6,939 6,659
Other policyholders' funds fair value disclosure 6,841 6,540
Notes payable 5,267 5,339
Notes payable, fair value disclosure 5,553 5,530
Total financial instrument liabilities not carried at fair value 12,206 11,998
Liabilities fair value disclosure financial instruments carried at cost 12,394 12,070
Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 38,072 40,021
Government and agencies | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 21,331 20,702
Securities held to maturity, fixed maturities, fair value 26,491 26,040
Municipalities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 357 350
Securities held to maturity, fixed maturities, fair value 462 457
Mortgage- and asset-backed securities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 26 30
Securities held to maturity, fixed maturities, fair value 27 32
Public utilities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 3,300 3,201
Securities held to maturity, fixed maturities, fair value 3,698 3,536
Sovereign and supranational | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 1,523 2,602
Securities held to maturity, fixed maturities, fair value 1,835 2,877
Banks/financial institutions | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 2,206 3,731
Securities held to maturity, fixed maturities, fair value 2,387 3,900
Other corporate | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 2,687 2,734
Securities held to maturity, fixed maturities, fair value 3,172 3,179
Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 210 184
Equity method investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 118  
Level 1    
Assets:    
Other investments, carried at amortized cost, fair value 0 [2] 0
Assets, fair value disclosure, financial instruments, carried at cost 26,491 26,040
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 | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 26,491 26,040
Level 1 | Government and agencies | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 26,491 26,040
Level 1 | Municipalities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 1 | Mortgage- and asset-backed securities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 1 | Public utilities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 1 | Sovereign and supranational | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 1 | Banks/financial institutions | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 1 | Other corporate | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 2    
Assets:    
Other investments, carried at amortized cost, fair value 15 [2] 0
Assets, fair value disclosure, financial instruments, carried at cost 11,577 13,959
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable, fair value disclosure 5,288 0
Liabilities fair value disclosure financial instruments carried at cost 5,288 0
Level 2 | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 11,562 13,959
Level 2 | Government and agencies | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 2 | Municipalities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 462 457
Level 2 | Mortgage- and asset-backed securities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 8 10
Level 2 | Public utilities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 3,698 3,536
Level 2 | Sovereign and supranational | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 1,835 2,877
Level 2 | Banks/financial institutions | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 2,387 3,900
Level 2 | Other corporate | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 3,172 3,179
Level 3    
Assets:    
Other investments, carried at amortized cost, fair value 2,987 [2] 1,142
Assets, fair value disclosure, financial instruments, carried at cost 3,006 1,164
Liabilities:    
Other policyholders' funds fair value disclosure 6,841 6,540
Notes payable, fair value disclosure 265 5,530
Liabilities fair value disclosure financial instruments carried at cost 7,106 12,070
Level 3 | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 19 22
Level 3 | Government and agencies | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 3 | Municipalities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 3 | Mortgage- and asset-backed securities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 19 22
Level 3 | Public utilities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 3 | Sovereign and supranational | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 3 | Banks/financial institutions | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 0 0
Level 3 | Other corporate | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value $ 0 $ 0
[1] Includes $2,341 in 2017 and $819 in 2016 of loan receivables and limited partnerships from consolidated variable interest entities
[2] Excludes policy loans of $210 and equity method investments of $118, at carrying value