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Financial Instruments Investment Segment and Holding Company Narrative (Details) (USD $)
9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Investment Funds [Member]
Dec. 31, 2011
Investment Funds [Member]
Dec. 31, 2011
Investment Funds [Member]
Credit default swaps [Member]
Dec. 31, 2011
Investment Funds [Member]
Credit default swaps [Member]
Maximum [Member]
Sep. 30, 2012
Federal-Mogul [Member]
Cash Flow Hedging [Member]
Sep. 30, 2012
Federal-Mogul [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Sep. 30, 2012
Federal-Mogul [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Derivative [Line Items]              
Maximum length of time hedged in fx cash flow hedge         1 year    
Derivative Instruments, Loss Recognized in Income           $ 6,000,000 $ 6,000,000
Maximum payout amounts relating to put options written 5,500,000,000 1,700,000,000          
Open Option Contracts Written, Covered Put Options on Existing Short Positions 5,400,000,000 1,400,000,000          
Unrealized gains on open option contracts written 140,000,000 24,000,000          
Fair value of derivative instruments with credit-risk related contingent features in a liability position 383,000,000 42,000,000          
Cash collateral posted for derivative positions 382,000,000 257,000,000          
Maximum notional amount of credit default swaps       $ 8,000,000      
Term of credit default swaps     1 year        
Maximum exposure related to credit default swaps, percentage of notional amounts     48.00%