Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

Valuation and Qualifying Accounts

	Year Ended December 31
(in Millions)	2011			2010			2009
Allowance for Doubtful Accounts (shown as deduction from Accounts Receivable in the Consolidated Statements of Financial Position)
Balance at Beginning of Period	$	93		$	118		$	121
Additions:
Charged to costs and expenses	47			57			62
Charged to other accounts (1)	8			8			7
Deductions (2)	(68		)	(90		)	(72		)
Balance At End of Period	$	80		$	93		$	118

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(1) Collection of accounts previously written off.

(2) Non-collectible accounts written off.