Fair Value Measurement (Details) - USD ($)
$ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Long-term Debt |
$ 1,203
|
$ 1,205
|
|
|
| Long-term Debt, Fair Value |
1,243
|
909
|
|
|
| Fair Value, Inputs, Level 1 [Member] |
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Long-term Debt, Fair Value |
0
|
0
|
|
|
| Fair Value, Inputs, Level 2 [Member] |
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Long-term Debt, Fair Value |
1,243
|
909
|
|
|
| Fair Value, Inputs, Level 3 [Member] |
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Long-term Debt, Fair Value |
$ 0
|
$ 0
|
|
|
| Energy Related Derivative [Member] | Maximum [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
|
|
| Derivative assets |
|
|
$ 1
|
$ 1
|