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Financial Instruments Investment Segment and Holding Company Narrative (Details) - Investment Funds [Member] - Investment Segment [Member] - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |
Maximum payout amount relating to certain put options |  |  | $ 5,900
Maximum payout amount relating to certain covered put options on existing short positions |  |  | 5,900
Fair value derivative instruments with credit risk related contingent features in a liability position |  | $ 448 | 33
Collateral for derivative positions |  | $ 423 | $ 883
Put Option [Member] |  |  |
Derivative [Line Items] |  |  |
Unrealized gains relating to certain put options | $ 67 |  |

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