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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Statement of Stockholders' Equity [Abstract]  
Increase to paid-in capital for change in ownership interest upon equity issuance $ 61
Net income (loss) attributable to common stockholders, including increase to paid-in capital for change in ownership interest upon equity issuance $ 1,632