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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities |
| 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 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
December 31, 2012 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 548 |  |  | $ | — |  |  | $ | — |  |  | $ | 548 |
Maturity 1 to 5 years | 93 |  |  | — |  |  | — |  |  | 93 |
Government-sponsored enterprise obligations |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 2 |  |  | — |  |  | — |  |  | 2 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity 1 to 5 years | 15 |  |  | — |  |  | — |  |  | 15 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 28 |  |  | — |  |  | — |  |  | 28 |
Maturity 1 to 5 years | 3 |  |  | — |  |  | — |  |  | 3 |
Equity securities |  |  |  |  |  |  |  |  |  |  |
Available-for-sale | 606 |  |  | 3 |  |  | (5 | ) |  | 604 |
| $ | 1,295 |  |  | $ | 3 |  |  | $ | (5 | ) |  | $ | 1,293 |

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