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Marketable Securities | 3 Months Ended
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Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
March 31, 2015 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 311 |  |  | $ | — |  |  | $ | — |  |  | $ | 311 |
Maturity 1 to 5 years | 95 |  |  | — |  |  | — |  |  | 95 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 73 |  |  | 1 |  |  | — |  |  | 74 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 95 |  |  | — |  |  | — |  |  | 95 |
Maturity 1 to 5 years | 3 |  |  | — |  |  | — |  |  | 3 |
Equity securities |  |  |  |  |  |  |  |  |  |
Available-for-sale | 307 |  |  | 32 |  |  | (4 | ) |  | 335 |
| $ | 884 |  |  | $ | 33 |  |  | $ | (4 | ) |  | $ | 913 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
December 31, 2014 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 385 |  |  | $ | — |  |  | $ | — |  |  | $ | 385 |
Maturity 1 to 5 years | 93 |  |  | — |  |  | — |  |  | 93 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 72 |  |  | — |  |  | — |  |  | 72 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 130 |  |  | — |  |  | — |  |  | 130 |
Maturity 1 to 5 years | 3 |  |  | — |  |  | — |  |  | 3 |
Equity securities |  |  |  |  |  |  |  |  |  |  |
Available-for-sale | 328 |  |  | 1 |  |  | (12 | ) |  | 317 |
| $ | 1,011 |  |  | $ | 1 |  |  | $ | (12 | ) |  | $ | 1,000 |
Of the $4 million in unrealized losses at March 31, 2015, $1 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 $4 million. The market value of the Company’s investment that has been in an unrealized loss position for 12 months or longer is $3 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 March 31, 2015.

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