Acquisitions (Proforma Information) (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 6 Months Ended |
|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2015 |
|
| Business Acquisition [Line Items] | ||
| Business Acquisition, Pro Forma Revenue | $ 1,053 | $ 2,153 |
| Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax | 478 | 996 |
| Business Acquisition, Pro Forma Net Income (Loss) | $ 299 | $ 632 |
| Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 2.49 | $ 5.25 |
| Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 2.48 | $ 5.22 |