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Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Tables) | 6 Months Ended
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Jun. 30, 2015
Summarized Financial Information of Equity Method Investment [Line Items] |
Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block] |
| Three Months Ended | Six Months Ended
| June 30, | June 30,
Income Statement | 2015 | 2014 | 2015 | 2014
| (In millions)
Operating revenues | $ | 590 |  | $ | 827 |  | $ | 1,206 |  | $ | 1,828 |
Cost of sales | 277 |  | 478 |  | 569 |  | 1,111 |
Operating income | 93 |  | 139 |  | 197 |  | 301 |
Net income | 77 |  | 120 |  | 168 |  | 269 |

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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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