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Investments and Marketable Securities - Aggregate Market Value and Unrealized Losses of Investments (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2014 USD ($) shares
Schedule of Available-for-sale Securities [Line Items] |
Number of investments | shares | 1
Aggregate Market Value | $ 1
Unrealized Losses | $ 0
Number of investments | shares | 15
Aggregate Market Value | $ 12
Unrealized Losses | $ 0
Government securities |
Schedule of Available-for-sale Securities [Line Items] |
Number of investments | shares | 0
Aggregate Market Value | $ 0
Unrealized Losses | $ 0
Number of investments | shares | 1
Aggregate Market Value | $ 8
Unrealized Losses | $ 0
State and municipal bonds |
Schedule of Available-for-sale Securities [Line Items] |
Number of investments | shares | 0
Aggregate Market Value | $ 0
Unrealized Losses | $ 0
Number of investments | shares | 2
Aggregate Market Value | $ 1
Unrealized Losses | $ 0
Corporate Securities |
Schedule of Available-for-sale Securities [Line Items] |
Number of investments | shares | 1
Aggregate Market Value | $ 1
Unrealized Losses | $ 0
Number of investments | shares | 11
Aggregate Market Value | $ 3
Unrealized Losses | $ 0
Other |
Schedule of Available-for-sale Securities [Line Items] |
Number of investments | shares | 0
Aggregate Market Value | $ 0
Unrealized Losses | $ 0
Number of investments | shares | 1
Aggregate Market Value | $ 0
Unrealized Losses | $ 0

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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