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Financial Instruments Investment Segment and Holding Company Narrative (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Non-cash investment segment contribution $ 0 $ 0 $ 185
Investment Segment [Member] | Investment Funds [Member]      
Derivative [Line Items]      
Fair value of derivative instruments with credit-risk related contingent features in a liability position 33 627  
Investment Segment [Member] | Investment Funds [Member] | Put Option [Member]      
Derivative [Line Items]      
Open Option Contracts Written, Covered Put Options on Existing Short Positions 5,900 2,400  
Unrealized Gain (Loss) on Derivatives 67 (1)  
Open Option Contract Written, Potential Payment Amount $ 5,900 $ 2,500  
Holding Company [Member] | Investment Segment [Member]      
Derivative [Line Items]      
Non-cash Investment segment contribution (derivative liability shares transferred)     9.7
Non-cash investment segment contribution     $ 234
Koala [Member] | Investment Segment [Member]      
Derivative [Line Items]      
Non-cash Investment segment contribution (derivative liability shares transferred)     7.7
Non-cash investment segment contribution     $ 185