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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities [Table Text Block] |
| Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (In millions)
September 30, 2017 |  |  |  |  |  |  |
United States government obligations |  |  |  |  |  |  |
Maturity less than 1 year | $ | 259 |  |  | $ | — |  |  | $ | — |  |  | $ | 259 |
Maturity 1 to 5 years | 117 |  |  | — |  |  | — |  |  | 117 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |
Maturity less than 1 year | 2 |  |  | — |  |  | — |  |  | 2 |
Maturity 1 to 5 years | 90 |  |  | — |  |  | — |  |  | 90 |
| $ | 468 |  |  | $ | — |  |  | $ | — |  |  | $ | 468 |
| 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 Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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