Commitments And Contingencies Environmental Matters (Details) - USD ($) $ in Millions |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Environmental Exit Cost [Line Items] | ||
| Accrual for Environmental Loss Contingencies | $ 6 | $ 4 |
| Accrued Environmental Loss Contingencies, Noncurrent | 5 | 3 |
| Accrued Liabilities | ||
| Environmental Exit Cost [Line Items] | ||
| Accrued Environmental Loss Contingencies, Current | 1 | 1 |
| Other Long-Term Liabilities | ||
| Environmental Exit Cost [Line Items] | ||
| Accrued Environmental Loss Contingencies, Noncurrent | $ 5 | 3 |
| Liabilities Held for Sale | Discontinued Operations | ||
| Environmental Exit Cost [Line Items] | ||
| Accrual for Environmental Loss Contingencies | $ 6 |