Registration of securities issued in business combination transactions

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS          
Decrease of capital expenditures in accounts payable $ 1 $ 12 $ 16 $ 14 $ (13)
Stock-based compensation $ 20 $ 17 $ 22 $ 24 $ 16