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Shareholders' Equity And Net Income Per Share Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Shareholders' Equity and Net Income Per Share Note [Abstract]                    
Cash dividends per share $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.5 $ 0.50 $ 1.00 $ 0.68
Payments of Cash Dividends $ 72 $ 73 $ 73 $ 75 $ 76 $ 77 $ 145   $ 301