Earnings (Loss) Per Share (Antidilutive Shares) (Details) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2016 |
Dec. 31, 2014 |
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Arrearage on dividend payments | $ 102 | |
| Share-based Awards | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share (shares) | 263,267 | |
| Warrant | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share (shares) | 306,310 |