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Financial Instruments Investment Segment and Holding Company Narrative (Details) (USD $) Share data in Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Derivative [Line Items] |  |  |
Non-cash investment segment contribution | $ 185,000,000 | $ 0 |
Investment Segment [Member] | Investment Funds [Member] |  |  |
Derivative [Line Items] |  |  |
Maximum payout amounts relating to put options written | 448,000,000 |  | 7,900,000,000
Covered put options on existing short positions |  |  | 6,800,000,000
Realized and unrealized gain (loss) on derivatives, net | 1,000,000 | 180,000,000 |
Fair value of derivative instruments with credit-risk related contingent features in a liability position | 499,000,000 |  | 84,000,000
Cash collateral posted for derivative positions | 413,000,000 |  | 148,000,000
Koala [Member] | Investment Segment [Member] |  |  |
Derivative [Line Items] |  |  |
Non-cash Investment segment contribution (derivative liability shares transferred) | 7.7 |  |
Non-cash investment segment contribution | 185,000,000 |  |
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 | $ 234,000,000 |  |

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959 + Details
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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=31042434&loc=d3e3602-108585 + Details
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