Supplemental Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Inventories

Total inventories consisted of the following:

(millions)	March 31, 2014		December 31, 2013
Finished goods and work in progress	$	275	$	270
Raw materials	57		62
Total	$	332	$	332

Asset Retirement Obligations

Changes in the liability for asset retirement obligations consisted of the following:

	Three months ended March 31,
(millions)	2014			2013
Balance as of January 1	$	132		$	139
Accretion expense	2			2
Changes in estimated cash flows (a)	(10		)	—
Liabilities settled	(2		)	—
Foreign currency translation	(2		)	(1		)
Balance as of March 31	$	120		$	140