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Financial Instruments Investment Segment and Holding Company Narrative (Details) (Investment Segment [Member], USD $)
Share data in Millions, unless otherwise specified
 6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Investment Funds [Member]
Dec. 31, 2013
Investment Funds [Member]
Aug. 31, 2013
Holding Company [Member]
Aug. 31, 2013
Koala [Member]
Jun. 30, 2014
Total Return Swap [Member]
Investment Funds [Member]
Dec. 31, 2013
Total Return Swap [Member]
Investment Funds [Member]
Dec. 31, 2013
Put Option [Member]
Investment Funds [Member]
Derivative [Line Items]              
Non-cash Investment segment contribution (derivative liability shares transferred)     9.7 7.7      
Non-cash investment segment contribution     $ 234,000,000 $ 185,000,000      
Maximum payout amounts relating to put options written 4,600,000,000 8,000,000,000          
Realized and unrealized gain (loss) on derivatives, net 20,000,000       45,000,000 14,000,000 131,000,000
Fair value of derivative instruments with credit-risk related contingent features in a liability position 1,400,000,000 639,000,000          
Cash collateral posted for derivative positions $ 1,200,000,000 $ 255,000,000