Auction rate securities, at Fair Value

No definition available.

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- Definition

Description of the average credit rating indicative of likelihood of repayment of debt instruments given by credit rating agencies (for example, Standard and Poor's, Moody's, Fitch).

+ References

No definition available.

+ Details

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- Definition

Financial Instruments Fair Value Assumptions Weighted Average Discount Rate

+ References

No definition available.

+ Details

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- Definition

Investment Holding Period

+ References

No definition available.

+ Details

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- Definition

The highest interest rate in the aggregated short-tem debt instruments.

+ References

No definition available.

+ Details

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- Definition

The lowest interest rate in the aggregated short-tem debt instruments.

+ References

No definition available.

+ Details

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- Definition

Joint Venture, Ownership Interest Percentage

+ References

No definition available.

+ Details

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- Definition

Number of Auction Rate Securities With Underlying Loans Which Have No Guarantees

+ References

No definition available.

+ Details

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- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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- Definition

Percentage of Loans Guaranteed

+ References

No definition available.

+ Details

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ 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 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: 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=6871852&loc=d3e26610-111562

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- Details

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended		6 Months Ended												6 Months Ended		6 Months Ended				12 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Security	Dec. 31, 2013	Jun. 30, 2014 Minimum	Jun. 30, 2014 Maximum	Jun. 30, 2014 US Government Agencies Debt Securities	Dec. 31, 2013 US Government Agencies Debt Securities	Jun. 30, 2014 US Corporate Debt Securities	Dec. 31, 2013 US Corporate Debt Securities	Jun. 30, 2014 High Yield Corporate Debt Securities	Dec. 31, 2013 High Yield Corporate Debt Securities	Jun. 30, 2014 Municipal Obligations	Dec. 31, 2013 Municipal Obligations	Jun. 30, 2014 Debt Securities	Dec. 31, 2013 Debt Securities	Jun. 30, 2014 Foreign Debt Securities	Dec. 31, 2013 Foreign Debt Securities	Jun. 30, 2014 Foreign Sovereign Debt Securities	Jun. 30, 2014 Auction Rate Securities	Dec. 31, 2013 Auction Rate Securities	Jun. 30, 2014 Variable Rate Demand Note	Dec. 31, 2012 LenovoEMC	Jun. 30, 2014 LenovoEMC
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized Gain (Loss) on Investments	$ 88,000,000
Joint Venture, Ownership Interest Percentage																							49.00%
Short-term investments	1,962,000,000	1,962,000,000	2,773,000,000																		34,000,000
Number of Auction Rate Securities With Underlying Loans Which Have No Guarantees		1
Available-for-sale Securities						2,204,000,000	3,727,000,000	2,298,000,000	2,266,000,000	577,000,000	531,000,000	968,000,000	863,000,000	8,652,000,000	9,602,000,000	2,521,000,000	2,155,000,000		59,000,000	60,000,000
Average credit rating																A+		AA+	AA
Investment Holding Period		5 years
Percentage of Available For Sale Securities Debt Securities																		5.00%
Auction rate securities that have partial guarantees by the U.S. government, market value	$ 0	$ 0
Coupon rate used to estimate fair value of invesments - Start Range				0.00%
Coupon rate used to estimate fair value of invesments - End Range					3.00%
Discount rate used to estimate fair value of investments		1.00%																				6.00%
The rate used for the discount margin to determine the estimated fair value of investment in auction rate securities	1.00%	1.00%	1.00%
Percentage of Loans Guaranteed	95.00%	95.00%