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Summary of Investments Other Than Investments in Related Parties (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost $ 40,659
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 41,978 [1]
Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 28,323
Summary of Investments, Other than Investments in Related Parties, Fair Value 29,643
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 29,643 [1]
US Treasury and Government [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 1,424
Summary of Investments, Other than Investments in Related Parties, Fair Value 1,382
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 1,382 [1]
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 480
Summary of Investments, Other than Investments in Related Parties, Fair Value 511
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 511 [1]
Foreign Government Debt [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 4,890 [2]
Summary of Investments, Other than Investments in Related Parties, Fair Value 6,035 [2]
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 6,035 [1],[2]
Public Utility, Bonds [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 1,955
Summary of Investments, Other than Investments in Related Parties, Fair Value 2,023
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 2,023 [1]
Asset-backed Securities [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 3,954
Summary of Investments, Other than Investments in Related Parties, Fair Value 4,007
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 4,007 [1]
All Other Corporate Bonds [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 15,620
Summary of Investments, Other than Investments in Related Parties, Fair Value 15,685
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 15,685 [1]
Nonredeemable Preferred Stock [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 86
Summary of Investments, Other than Investments in Related Parties, Fair Value 88
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 88 [1]
Other Equity Securities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 41
Summary of Investments, Other than Investments in Related Parties, Fair Value 38
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 38 [1]
Equity Securities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 127
Summary of Investments, Other than Investments in Related Parties, Fair Value 126
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 126 [1]
Mortgage Loans on Real Estate [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 3,130
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 3,130 [1]
Policy Loans [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 1,469
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 1,469 [1]
Funds Withheld At Interest [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 5,880
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 5,880 [1]
Short-term Investments [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 558
Summary of Investments, Other than Investments in Related Parties, Carrying Amount 558 [1]
Other Invested Assets [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Summary of Investments, Other than Investments in Related Parties, Cost 1,172
Summary of Investments, Other than Investments in Related Parties, Carrying Amount $ 1,172 [1]
[1] Fixed maturity securities are classified as available-for-sale and carried at fair value.
[2] Includes fixed maturities directly issued by foreign governments, supranational and foreign government-sponsored enterprises.