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Investments and Derivative Instruments Level 4 Derivative Collateral Arrangements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Mar. 31, 2016
Derivative Collateral Arrangements [Line Items]    
Derivative, Notional Amount $ 62,185 $ 61,322
Security Owned and Pledged as Collateral, Fair Value 488 447
Fair Value of Securities Received as Collateral that Can be Resold or Repledged 100 116
Securities Received as Collateral, Amount Repledged and Sold 0  
Derivative Asset, Collateral, Obligation to Return Cash, Offset 369 419
Derivative, Collateral, Obligation to Return Securities 100 116
Available-for-sale Equity Securities, Amortized Cost Basis 1,135 767
Fixed Maturities [Member]    
Derivative Collateral Arrangements [Line Items]    
Security Owned and Pledged as Collateral, Fair Value 1,100 $ 1,300
Equity Securities [Member]    
Derivative Collateral Arrangements [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis $ 293