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CONSOLIDATED STATEMENT OF FINANCIAL POSITION (Unaudited) (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets [Abstract]
Accumulated depreciation	$ 4,644	$ 4,590
EQUITY (DEFICIT)
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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