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Fair Value Measurements (Schedule of Carrying Values and Fair Values of Financial Instruments) (Details) (USD $)
In Millions, unless otherwise specified
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Sep. 30, 2014
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Dec. 31, 2013
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cost investments, carrying amount |
$ 145 |
$ 145 |
| Cost investments, fair value |
0 |
0 |
| Insurance contracts in nonqualified trusts, carrying amount |
57 |
62 |
| Insurance contracts in nonqualified trusts, fair value |
57 |
62 |
| Long-term debt, including current installments of long-term debt, carrying amount |
3,264 |
2,911 |
| Long-term debt, including current installments of long-term debt, fair value |
3,296 |
2,960 |
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Significant Other Observable Inputs (Level 2) [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cost investments, fair value |
0 |
0 |
| Insurance contracts in nonqualified trusts, fair value |
57 |
62 |
| Long-term debt, including current installments of long-term debt, fair value |
3,028 |
2,696 |
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Unobservable Inputs (Level 3) [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Cost investments, fair value |
0 |
0 |
| Insurance contracts in nonqualified trusts, fair value |
0 |
0 |
| Long-term debt, including current installments of long-term debt, fair value |
$ 268 |
$ 264 |