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Dividends (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Dec. 31, 2011
Dividends        
Dividends paid   $ 700 $ 700  
Dividend declared $ 390     $ 310