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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets by Pricing Source, Securities Carried at 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]    
Held to maturity, fixed maturity securities, fair value $ 36,250 $ 38,072
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 25,868 26,491
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 10,367 11,562
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 15 19
Government and agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 25,876 26,491
Government and agencies | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 25,868 26,491
Government and agencies | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 8 0
Government and agencies | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Government and agencies | Third party pricing vendor valuation technique    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 25,876 26,491
Government and agencies | Third party pricing vendor valuation technique | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 25,868 26,491
Government and agencies | Third party pricing vendor valuation technique | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 8 0
Government and agencies | Third party pricing vendor valuation technique | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Municipalities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 450 462
Municipalities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Municipalities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 450 462
Municipalities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Municipalities | Third party pricing vendor valuation technique    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 450 462
Municipalities | Third party pricing vendor valuation technique | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Municipalities | Third party pricing vendor valuation technique | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 450 462
Municipalities | Third party pricing vendor valuation technique | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Mortgage- and asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 15 27
Mortgage- and asset-backed securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Mortgage- and asset-backed securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 8
Mortgage- and asset-backed securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 15 19
Mortgage- and asset-backed securities | Third party pricing vendor valuation technique    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value   8
Mortgage- and asset-backed securities | Third party pricing vendor valuation technique | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value   0
Mortgage- and asset-backed securities | Third party pricing vendor valuation technique | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value   8
Mortgage- and asset-backed securities | Third party pricing vendor valuation technique | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value   0
Mortgage- and asset-backed securities | Consensus pricing valuation technique    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 15 19
Mortgage- and asset-backed securities | Consensus pricing valuation technique | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Mortgage- and asset-backed securities | Consensus pricing valuation technique | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Mortgage- and asset-backed securities | Consensus pricing valuation technique | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 15 19
Public utilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 3,451 3,698
Public utilities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Public utilities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 3,451 3,698
Public utilities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Public utilities | Third party pricing vendor valuation technique    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 3,451 3,698
Public utilities | Third party pricing vendor valuation technique | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Public utilities | Third party pricing vendor valuation technique | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 3,451 3,698
Public utilities | Third party pricing vendor valuation technique | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Sovereign and supranational    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 1,792 1,835
Sovereign and supranational | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Sovereign and supranational | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 1,792 1,835
Sovereign and supranational | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Sovereign and supranational | Third party pricing vendor valuation technique    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 1,792 1,835
Sovereign and supranational | Third party pricing vendor valuation technique | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Sovereign and supranational | Third party pricing vendor valuation technique | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 1,792 1,835
Sovereign and supranational | Third party pricing vendor valuation technique | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Banks/financial institutions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 1,643 2,387
Banks/financial institutions | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Banks/financial institutions | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 1,643 2,387
Banks/financial institutions | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Banks/financial institutions | Third party pricing vendor valuation technique    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 1,643 2,387
Banks/financial institutions | Third party pricing vendor valuation technique | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Banks/financial institutions | Third party pricing vendor valuation technique | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 1,643 2,387
Banks/financial institutions | Third party pricing vendor valuation technique | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Other corporate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 3,023 3,172
Other corporate | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Other corporate | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 3,023 3,172
Other corporate | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Other corporate | Third party pricing vendor valuation technique    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 3,023 3,172
Other corporate | Third party pricing vendor valuation technique | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 0 0
Other corporate | Third party pricing vendor valuation technique | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value 3,023 3,172
Other corporate | Third party pricing vendor valuation technique | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held to maturity, fixed maturity securities, fair value $ 0 $ 0