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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Statement of Stockholders' Equity [Abstract]
Increase to paid-in capital for change in ownership interest upon equity issuance	$ 2
Net income (loss) attributable to common stockholders, including increase to paid-in capital for change in ownership interest upon equity issuance	$ 462

This element represents the total net income attributable to the parent for the period and the effect of net changes during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not result in a deconsolidation of the subsidiary from the consolidated financial statements.

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