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Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Tables) | 3 Months Ended
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Mar. 31, 2015
Summarized Financial Information of Equity Method Investment [Line Items] |
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] |
| Three Months Ended
| March 31,
Income Statement | 2015 | 2014
| (In millions)
Operating revenues | $ | 616 |  | $ | 1,002 |
Cost of sales | 292 |  | 633 |
Operating income | 104 |  | 162 |
Net income | 91 |  | 149 |

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- Definition Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] + References No definition available. + Details
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