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Consolidated Statement of Cash Flows (Unaudited) (Parenthetical) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Consolidated Statement of Cash Flows [Abstract]    
Cash at beginning period, Discontinued operations$ 0$ 117$ 0$ 1,246
Cash at ending period, Discontinued operations$ 0$ 117$ 0$ 1,246