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Financial Instruments Investment Segment and Holding Company Narrative (Details) (Investment Segment [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Investment Funds [Member]
Dec. 31, 2013
Investment Funds [Member]
Aug. 31, 2013
Holding Company [Member]
Aug. 31, 2013
Koala [Member]
Mar. 31, 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 $ 185      
Maximum payout amounts relating to put options written 302 8,000          
Realized and unrealized gain (loss) on derivatives, net 1       21 14 131
Fair value of derivative instruments with credit-risk related contingent features in a liability position 820 639          
Cash collateral posted for derivative positions $ 634 $ 255