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Marketable Securities | 6 Months Ended
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Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
June 30, 2017 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 234 |  |  | $ | — |  |  | $ | — |  |  | $ | 234 |
Maturity 1 to 5 years | 112 |  |  | — |  |  | — |  |  | 112 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 3 |  |  | — |  |  | — |  |  | 3 |
Maturity 1 to 5 years | 87 |  |  | — |  |  | — |  |  | 87 |
| $ | 436 |  |  | $ | — |  |  | $ | — |  |  | $ | 436 |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
December 31, 2016 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 287 |  |  | $ | — |  |  | $ | — |  |  | $ | 287 |
Maturity 1 to 5 years | 121 |  |  | — |  |  | (1 | ) |  | 120 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 1 |  |  | — |  |  | — |  |  | 1 |
Maturity 1 to 5 years | 66 |  |  | — |  |  | — |  |  | 66 |
Other debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 8 |  |  | — |  |  | — |  |  | 8 |
Equity securities |  |  |  |  |  |  |  |  |  |  |
Available-for-sale | 1 |  |  | — |  |  | — |  |  | 1 |
| $ | 484 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 483 |

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