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Supplemental Equity and Comprehensive Income Information (Details 6) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Supplemental Equity and Comprehensive Income Information        
Dividends declared in current period (in dollars per share) $ 0.855     $ 3.395
Dividends paid in current period (in dollars per share)   $ 0.855 $ 0.635 $ 2.54
Increase of Current Liabilities due to dividend declared but not paid $ 567     $ 567