Marketable Securities - Schedule of Marketable Securities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 164	$ 109
Unrealized Gains (Losses)	5	1
Fair Value	169	110
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	38	27
Unrealized Gains (Losses)	0	0
Fair Value	38	27
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	36	30
Unrealized Gains (Losses)		(1)
Fair Value	36	29
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	23	21
Unrealized Gains (Losses)
Fair Value	23	21
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	67	31
Unrealized Gains (Losses)	5	2
Fair Value	$ 72	$ 33

Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

No definition available.

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: 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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: 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=6871852&loc=d3e26626-111562

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