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Fair Value Measurements Other Segments Fair Value (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 9 Months Ended
Sep. 30, 2013
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 1 [Member]
Dec. 31, 2012
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 1 [Member]
Sep. 30, 2013
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 2 [Member]
Dec. 31, 2012
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 2 [Member]
Sep. 30, 2013
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 3 [Member]
Dec. 31, 2012
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 3 [Member]
Sep. 30, 2013
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Total fair value [Member]
Dec. 31, 2012
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Total fair value [Member]
Sep. 30, 2013
Property, plant and equipment
Sep. 30, 2012
Property, plant and equipment
Jun. 30, 2012
Property, plant and equipment
Sep. 30, 2013
Intangible assets
Sep. 30, 2012
Intangible assets
Jun. 30, 2012
Intangible assets
Assets [Abstract]                            
Marketable equity and debt securities $ 1 $ 1 $ 0 $ 0 $ 0 $ 0 $ 1 $ 1            
Trading securities 0 0 0 0 114 60 114 60            
Derivative contracts, at fair value (asset) 0 [1] 0 [1] 110 [1] 1 [1] 0 [1] 21 [1] 110 [1] 22 [1]            
Fair value of investment and derivative assets 1 1 110 1 114 81 225 83            
Fair Value of Level 3 Asset                 25   77 0   56
Recognized Impairment                 7 39   0 48  
Liabilities [Abstract]                            
Other liabilities 0 0 0 1 0 0 0 1            
Derivative contracts at fair value (liability) 0 [2] 0 [2] 269 [2] 89 [2] 0 [2] 0 [2] 269 [2] 89 [2]            
Fair value of derivative and other liabilities $ 0 $ 0 $ 269 $ 90 $ 0 $ 0 $ 269 $ 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.