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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Stockholders' Equity [Abstract]        
Payments of ordinary dividends     $ 296 $ 287
Dividends paid per share $ 0.24 $ 0.22    
Proceeds from stock option exercises     $ 4 $ 92