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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | The following table sets forth items in short-term and long-term investments.
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
December 31, 2017 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity 1 to 5 years | $ | 92 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 91 |
Corporate debt securities |  |  |  |  |  |  |
Maturity 1 to 5 years | 1 |  |  | — |  |  | — |  |  | 1 |
| $ | 93 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 92 |
| 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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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