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Derivative Instruments (Summary Of Effect Of Derivative Instruments On Consolidated Statement Of Operations) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Derivatives In Fair Value Hedging Relationships [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | $ (6) | $ (42) | $ (40)
Gain (Loss) Recognized in Income on Hedged item | 6 | 41 | 32
Net Gain (Loss) Recognized in Income | (9) | (6) | (5)
Derivatives In Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | (8) | (42) |
Gain (Loss) Recognized in Income on Hedged item | 8 | 41 |
Net Gain (Loss) Recognized in Income |  | (1) |
Derivatives In Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Interest Income (Expense) [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (9) | (5) | 2
Derivatives In Fair Value Hedging Relationships [Member] | Interest Rate Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative |  |  | (57)
Gain (Loss) Recognized in Income on Hedged item |  |  | 48
Net Gain (Loss) Recognized in Income |  |  | (9)
Derivatives In Fair Value Hedging Relationships [Member] | Currency Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | 2 |  |
Gain (Loss) Recognized in Income on Hedged item | (2) |  |
Derivatives In Fair Value Hedging Relationships [Member] | Currency Swaps [Member] | Interest Income (Expense) [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income |  |  | 1
Derivatives In Fair Value Hedging Relationships [Member] | Currency Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative |  |  | 17
Gain (Loss) Recognized in Income on Hedged item |  |  | (16)
Net Gain (Loss) Recognized in Income |  |  | 1
Derivatives Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (2,960) | (912) | 1,554
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (193) |  | 17
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income |  | (138) |
Derivatives Not Designated As Hedging Instruments [Member] | Currency Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (1) |  | (1)
Derivatives Not Designated As Hedging Instruments [Member] | Currency Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income |  | 10 |
Derivatives Not Designated As Hedging Instruments [Member] | Insured Credit Default Swaps [Member] | Unrealized Gains (Losses) On Insured Derivatives [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (389) | (596) | 1,660
Derivatives Not Designated As Hedging Instruments [Member] | Insured Credit Default Swaps [Member] | Realized Gains (Losses) And Other Settlements On Insured Derivatives [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (2,371) | (162) | (167)
Derivatives Not Designated As Hedging Instruments [Member] | Insured Swaps [Member] | Unrealized Gains (Losses) On Insured Derivatives [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income |  | 2 | 1
Derivatives Not Designated As Hedging Instruments [Member] | Non-Insured Credit Default Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (2) |  | 17
Derivatives Not Designated As Hedging Instruments [Member] | Non-Insured Credit Default Swaps [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income |  | (1) |
Derivatives Not Designated As Hedging Instruments [Member] | Non-Insured Credit Default Swaps-VIE [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | 12 | (24) |
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swaps-VIE [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | 53 | 25 | 13
Derivatives Not Designated As Hedging Instruments [Member] | Other [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (6) | (17) | (8)
Derivatives Not Designated As Hedging Instruments [Member] | Other [Member] | Unrealized Gains (Losses) On Insured Derivatives [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (52) | (13) | (11)
Derivatives Not Designated As Hedging Instruments [Member] | All Other-VIE [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (8) | (16) |
Derivatives Not Designated As Hedging Instruments [Member] | Credit Linked Notes [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income |  |  | 27
Derivatives Not Designated As Hedging Instruments [Member] | Credit Linked Notes [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income |  | 18 |
Derivatives Not Designated As Hedging Instruments [Member] | Total Return Swap [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income |  |  | 6
Derivatives Not Designated As Hedging Instruments [Member] | Currency Swaps -VIE [Member] | Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | $ (3) |  |

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- Definition Gain Loss On Derivatives Recognized In Income + References No definition available. + Details
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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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