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 | ||