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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Current Assets:
Reserves on receivables	$ 18	$ 17
Accumulated depreciation and depletion on property, plant and equipment	$ 1,619	$ 1,546

- 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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