Valuation and Qualifying Accounts Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts [Abstract]

Summary of Valuation Allowance

	Year Ended December 31,
	2014			2013			2012
	(In millions)
Allowance for Doubtful Accounts (shown as deduction from Accounts Receivable in the Consolidated Statements of Financial Position)
Balance at Beginning of Period	$	28		$	35		$	80
Additions:
Charged to costs and expenses	50			52			40
Charged to other accounts (a)	10			11			7
Deductions (b)	(59		)	(70		)	(92		)
Balance at End of Period	$	29		$	28		$	35

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(a) Collection of accounts previously written off.

(b) Uncollectible accounts written off.