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Fair Value Measurements Other Segments Fair Value (Details) (Other Segments and Holding Company [Member], Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
   
Assets [Abstract]    
Marketable equity and debt securities $ 1 $ 20
Trading securities 0 0
Investments in precious metals 0 150
Derivative contracts, Assets at fair value 0 [1] 0 [1]
Assets, Fair Value Disclosure 1 170
Liabilities [Abstract]    
Derivative Liabilities 0 [2] 0 [2]
Fair Value, Inputs, Level 2 [Member]
   
Assets [Abstract]    
Marketable equity and debt securities 0 0
Trading securities 60 0
Investments in precious metals 0 0
Derivative contracts, Assets at fair value 0 [1] 3 [1]
Assets, Fair Value Disclosure 60 3
Liabilities [Abstract]    
Derivative Liabilities 144 [2] 57 [2]
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Assets [Abstract]    
Marketable equity and debt securities 1 20
Trading securities 60 0
Investments in precious metals 0 150
Derivative contracts, Assets at fair value 0 [1] 3 [1]
Assets, Fair Value Disclosure 61 173
Liabilities [Abstract]    
Derivative Liabilities $ 144 [2] $ 57 [2]
[1] Amounts are classified within other assets in our consolidated balance sheets.
[2] Amounts are classified within accrued expenses and other liabilities in our consolidated balance sheets.