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