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Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities [Text Block] | Marketable Securities
| 2017 |  | 2016
| Cost |  | Unrealized Gains (Losses) |  | Fair Value |  | Cost |  | Unrealized Gains (Losses) |  | Fair Value
U.S. government securities | $ | 3 |  |  | $ | — |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |
Corporate securities | 5 |  |  |  |  |  | 5 |  |  | 2 |  |  |  |  |  | 2 |
Certificates of deposit | 27 |  |  |  |  |  | 27 |  |  | 22 |  |  |  |  | 22 |
Other | 4 |  |  | 1 |  |  | 5 |  |  | 4 |  |  |  |  |  | 4 |
Total marketable securities | $ | 39 |  |  | $ | 1 |  |  | $ | 40 |  |  | $ | 30 |  |  | $ | — |  |  | $ | 30 |
U.S. government securities include bonds issued by government-sponsored agencies and Treasury notes. Corporate securities include primarily debt securities. Other consists of investments in mutual and index funds. U.S. government securities, corporate debt and certificates of deposit maturing in one year or less, after one year through five years and after five years through ten years total $27, $5 and $3 at December 31, 2017.

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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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