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Financial Instruments Derivative Activities Table (Details) - Investment Segment - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Equity contracts    
Derivative [Line Items]    
Long Notional Exposure $ 239 $ 243
Short Notional Exposure 6,850 6,660
Credit contracts    
Derivative [Line Items]    
Long Notional Exposure [1] 0 0
Short Notional Exposure [1] 0 391
Commodity contracts    
Derivative [Line Items]    
Long Notional Exposure 0 0
Short Notional Exposure $ 237 634
Credit Default Swap [Member]    
Derivative [Line Items]    
Notional value of interest rate swap agreements   $ 2,500
[1] The short notional amount on our credit default swap positions was approximately $2.5 billion as of December 31, 2017. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is $391 million as of December 31, 2017.