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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

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