|
Fair Value Level 4 (Details) - Fair Value of Debt (USD $)
In Millions, unless otherwise specified
|
Dec. 31, 2014
|
Dec. 31, 2013
|
| Carrying Amount [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt |
$ 3,834 |
$ 3,774 |
| Fair Value, Inputs, Level 1 [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt |
0 |
0 |
| Fair Value, Inputs, Level 2 [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt |
3,386 |
3,820 |
| Fair Value, Inputs, Level 3 [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt |
9 |
10 |
| Total Fair Value [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt |
$ 3,395 |
$ 3,830 |