Investments and Marketable Securities - Aggregate Market Value and Unrealized Losses of Investments (Detail) $ in Millions	12 Months Ended
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

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.

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

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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.

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity 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 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: 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

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months.

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