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Marketable Securities | 9 Months Ended
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Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
September 30, 2014 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 282 |  |  | $ | — |  |  | $ | — |  |  | $ | 282 |
Maturity 1 to 5 years | 90 |  |  | — |  |  | — |  |  | 90 |
Government–sponsored enterprise obligations |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 1 |  |  | — |  |  | — |  |  | 1 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 74 |  |  | — |  |  | — |  |  | 74 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 66 |  |  | — |  |  | — |  |  | 66 |
Maturity 1 to 5 years | 3 |  |  | — |  |  | — |  |  | 3 |
Equity securities |  |  |  |  |  |  |  |  |  |
Available-for-sale | 355 |  |  | 2 |  |  | (7 | ) |  | 350 |
| $ | 871 |  |  | $ | 2 |  |  | $ | (7 | ) |  | $ | 866 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
December 31, 2013 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 395 |  |  | $ | — |  |  | $ | — |  |  | $ | 395 |
Maturity 1 to 5 years | 124 |  |  | — |  |  | — |  |  | 124 |
Government–sponsored enterprise obligations |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 4 |  |  | — |  |  | — |  |  | 4 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 16 |  |  | — |  |  | — |  |  | 16 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 38 |  |  | — |  |  | — |  |  | 38 |
Maturity 1 to 5 years | 3 |  |  | — |  |  | — |  |  | 3 |
Equity securities |  |  |  |  |  |  |  |  |  |  |
Available-for-sale | 362 |  |  | 1 |  |  | (2 | ) |  | 361 |
| $ | 942 |  |  | $ | 1 |  |  | $ | (2 | ) |  | $ | 941 |
Of the $7 million in unrealized losses at September 30, 2014, $5 million arose within the last 12 months and is related to the Company’s investment in one available-for-sale equity security with a fair value of $6 million. The market value of the Company’s investment that has been in an unrealized loss position for 12 months or longer is $4 million and is related to one available-for-sale equity security. The Company evaluated the near-term prospects of the issuers in relation to the severity and duration of the impairment. Based on that evaluation and the Company’s ability and intent to hold these investments for a reasonable period of time sufficient for a forecasted recovery of fair value, the Company does not consider these investments to be other-than-temporarily impaired at September 30, 2014.

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