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Financial Instruments Investment Segment and Holding Company Narrative (Details) - Investment Funds [Member] - Investment Segment [Member] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2016
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 | 33 | $ 766
Collateral for derivative positions | 883 | $ 492
Put Option [Member] |  |
Derivative [Line Items] |  |
Unrealized gains relating to certain put options | $ 67 |

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