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Fair Value Measurements Other Segments Fair Value (Details) (Other Segments and Holding Company [Member], Recurring measurement [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Level 1 [Member]
   
Assets [Abstract]    
Marketable equity and debt securities $ 1 $ 1
Trading securities 0 0
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 1 1
Liabilities [Abstract]    
Other liabilities 0 0
Derivative contracts at fair value (liability) 0 [2] 0 [2]
Fair value of derivative and other liabilities 0 0
Level 2 [Member]
   
Assets [Abstract]    
Marketable equity and debt securities 0 0
Trading securities 0 0
Derivative contracts, at fair value (asset) 1 [1] 1 [1]
Fair value of investment and derivative assets 1 1
Liabilities [Abstract]    
Other liabilities 32 1
Derivative contracts at fair value (liability) 45 [2] 89 [2]
Fair value of derivative and other liabilities 77 90
Level 3 [Member]
   
Assets [Abstract]    
Marketable equity and debt securities 0 0
Trading securities 125 60
Derivative contracts, at fair value (asset) 0 [1] 21 [1]
Fair value of investment and derivative assets 125 81
Liabilities [Abstract]    
Other liabilities 0 0
Derivative contracts at fair value (liability) 0 [2] 0 [2]
Fair value of derivative and other liabilities 0 0
Total fair value [Member]
   
Assets [Abstract]    
Marketable equity and debt securities 1 1
Trading securities 125 60
Derivative contracts, at fair value (asset) 1 [1] 22 [1]
Fair value of investment and derivative assets 127 83
Liabilities [Abstract]    
Other liabilities 32 1
Derivative contracts at fair value (liability) 45 [2] 89 [2]
Fair value of derivative and other liabilities $ 77 $ 90
[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.