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Consolidated Balance Sheets Balance Sheet Parentheticals (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 50	$ 54
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 636	$ 772

- 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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