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Acquisitions and Sales of Other Assets (Narrative - Change in PPA) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Purchase Price Allocation Adjustments [Member]
Significant Acquisitions and Disposals [Line Items]    
Current assets $ 3,204  
Property, plant and equipment 23,141 (138)
Goodwill 12,469 2
Other long-term assets, excluding goodwill 9,990 (4)
Current liabilities, including current maturities of long-term debt 3,593 12
Long-term liabilities, preferred stock and noncontrolling interests $ 10,394 $ (152)