| **Quarterly Financial Data (Unaudited) (Tables)** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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| **Quarterly Financial Data [Abstract]**           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Schedule of quarterly financial information       | Quarterly Financial Data2014         (In millions, except per share data)First Second Third Fourth Full YearRevenues$2,463 $2,440 $2,411 $2,378 $9,692Net income (loss) (a)$13 $267 $213 $198 $691Basic earnings (loss) per share$0.05 $0.99 $0.79 $0.73 $2.56Diluted earnings (loss) per share$0.05 $0.98 $0.79 $0.73 $2.552013         (In millions, except per share data)First Second Third Fourth Full YearRevenues$2,455 $2,450 $2,458 $2,569 $9,932Net income (loss)$250 $194 $272 $221 $937Basic earnings (loss) per share$0.93 $0.72 $1.01 $0.82 $3.48Diluted earnings (loss) per share (b)$0.93 $0.72 $1.01 $0.82 $3.47____________________(a)Net income in the first quarter of 2014 includes the impairment loss on the sale of CAC.(b)Due to the averaging of shares, quarterly earnings per share do not add to the total for the full year. |

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| - Definition
Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306
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