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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, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments [1] $ 5,073 $ 3,402
Assets:    
Securities held to maturity, fixed maturities, amortized cost 33,377 31,430
Securities held to maturity, fixed maturities, fair value 40,468 38,072
Other investments carried at amortized cost 4,608 [2] 3,017 [3]
Other investments carried at amortized cost, fair value 4,590 [2] 3,002 [3]
Total financial instruments assets not carried at fair value 37,985 34,447
Assets fair value disclosure financial instruments carried at cost 45,058 41,074
Liabilities:    
Other policyholder funds 7,417 6,939
Other policyholders' funds fair value disclosure 7,307 6,841
Notes payable 5,352 5,267
Notes payable fair value disclosure 5,427 5,553
Total financial instrument liabilities not carried at fair value 12,769 12,206
Liabilities fair value disclosure financial instruments carried at cost 12,734 12,394
Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 40,468 38,072
Government and agencies | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 22,686 21,331
Securities held to maturity, fixed maturities, fair value 28,317 26,491
Municipalities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 379 357
Securities held to maturity, fixed maturities, fair value 493 462
Mortgage- and asset-backed securities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 26 26
Securities held to maturity, fixed maturities, fair value 28 27
Public utilities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 3,508 3,300
Securities held to maturity, fixed maturities, fair value 3,891 3,698
Sovereign and supranational | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 1,620 1,523
Securities held to maturity, fixed maturities, fair value 1,919 1,835
Banks/financial institutions | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 2,300 2,206
Securities held to maturity, fixed maturities, fair value 2,477 2,387
Other corporate | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, amortized cost 2,858 2,687
Securities held to maturity, fixed maturities, fair value 3,343 3,172
Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 227 210
Equity method investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 238 118
Level 1    
Assets:    
Other investments carried at amortized cost, fair value 0 [2] 0 [3]
Assets fair value disclosure financial instruments carried at cost 28,317 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 | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 28,317 26,491
Level 1 | Government and agencies | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 28,317 26,491
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] 15 [3]
Assets fair value disclosure financial instruments carried at cost 12,147 11,577
Liabilities:    
Other policyholders' funds fair value disclosure 0 0
Notes payable fair value disclosure 5,146 5,288
Liabilities fair value disclosure financial instruments carried at cost 5,146 5,288
Level 2 | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 12,132 11,562
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 493 462
Level 2 | Mortgage- and asset-backed securities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 9 8
Level 2 | Public utilities | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 3,891 3,698
Level 2 | Sovereign and supranational | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 1,919 1,835
Level 2 | Banks/financial institutions | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 2,477 2,387
Level 2 | Other corporate | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 3,343 3,172
Level 3    
Assets:    
Other investments carried at amortized cost, fair value 4,575 [2] 2,987 [3]
Assets fair value disclosure financial instruments carried at cost 4,594 3,006
Liabilities:    
Other policyholders' funds fair value disclosure 7,307 6,841
Notes payable fair value disclosure 281 265
Liabilities fair value disclosure financial instruments carried at cost 7,588 7,106
Level 3 | Fixed maturities    
Assets:    
Securities held to maturity, fixed maturities, fair value 19 19
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 19
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 $3,994 in 2018 and $2,341 in 2017 of loan receivables and limited partnerships from consolidated variable interest entities
[2] Excludes policy loans of $227 and equity method investments of $238, at carrying value
[3] Excludes policy loans of $210 and equity method investments of $118, at carrying value