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Financial Instruments Investment Segment and Holding Company Narrative (Details) - Investment Segment [Member] - Investment Funds [Member] - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Maximum payout amounts relating to put options written | $ 5,700 |  | $ 2,500
Open Option Contracts Written, Covered Put Options on Existing Short Positions | 5,700 |  | 2,400
Fair value of derivative instruments with credit-risk related contingent features in a liability position | 92 |  | 614
Cash collateral posted for derivative positions | 905 |  | $ 1,200
Put Option [Member] |  |  |
Derivative [Line Items] |  |  |
Realized and unrealized gain (loss) on derivatives, net | $ (35) | $ (1) |

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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