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Assets And Liabilities Measured At Fair Value On A Recurring Basis (Detail) (USD $)
In Millions

Sep. 30, 2011

Dec. 31, 2010

Auction rate securities

$ 120

Time deposits | Fair Value, Measurements, Recurring

Cash equivalents

112

973

Marketable securities

414

307

Time deposits | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Cash equivalents

0

0

Marketable securities

0

0

Time deposits | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Cash equivalents

112

973

Marketable securities

414

307

Time deposits | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Cash equivalents

0

0

Marketable securities

0

0

Money market and other funds | Fair Value, Measurements, Recurring

Cash equivalents

5,559

7,547

Money market and other funds | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Cash equivalents

3,649

5,936

Money market and other funds | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Cash equivalents

1,910

^[1]

1,611

^[1]

Money market and other funds | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Cash equivalents

0

0

U.S. government agencies | Fair Value, Measurements, Recurring

Cash equivalents

450

Marketable securities

6,860

1,857

U.S. government agencies | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Cash equivalents

0

Marketable securities

0

0

U.S. government agencies | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Cash equivalents

450

Marketable securities

6,860

1,857

U.S. government agencies | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Cash equivalents

0

Marketable securities

0

0

U.S. government notes | Fair Value, Measurements, Recurring

Cash equivalents

300

300

Marketable securities

5,961

3,930

U.S. government notes | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Cash equivalents

300

300

Marketable securities

5,961

3,930

U.S. government notes | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Cash equivalents

0

0

Marketable securities

0

0

U.S. government notes | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Cash equivalents

0

0

Marketable securities

0

0

Foreign government bonds | Fair Value, Measurements, Recurring

Cash equivalents

150

Marketable securities

1,961

1,172

Foreign government bonds | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Cash equivalents

0

Marketable securities

0

0

Foreign government bonds | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Cash equivalents

150

Marketable securities

1,961

1,172

Foreign government bonds | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Cash equivalents

0

Marketable securities

0

0

Municipal securities | Fair Value, Measurements, Recurring

Marketable securities

2,252

2,503

Municipal securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Marketable securities

0

0

Municipal securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Marketable securities

2,252

2,503

Municipal securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Marketable securities

0

0

Corporate debt securities | Fair Value, Measurements, Recurring

Cash equivalents

8

Marketable securities

7,298

5,742

Corporate debt securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Cash equivalents

0

Marketable securities

0

0

Corporate debt securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Cash equivalents

8

Marketable securities

7,298

5,742

Corporate debt securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Cash equivalents

0

Marketable securities

0

0

Agency residential mortgage-backed securities | Fair Value, Measurements, Recurring

Marketable securities

7,062

5,673

Agency residential mortgage-backed securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Marketable securities

0

0

Agency residential mortgage-backed securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Marketable securities

7,062

5,673

Agency residential mortgage-backed securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Marketable securities

0

0

Marketable equity securities | Fair Value, Measurements, Recurring

Marketable securities

122

161

Marketable equity securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Marketable securities

122

161

Marketable equity securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Marketable securities

0

0

Marketable equity securities | Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Marketable securities

0

0

Fair Value, Measurements, Recurring

Derivative contracts

349

342

Auction rate securities

120

153

38,820

30,818

Liabilities

Derivative contracts

2

8

2

8

Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Quoted Prices in Active Markets for Identical Assets (Level 1)

Derivative contracts

1

0

Auction rate securities

0

0

10,033

10,327

Liabilities

Derivative contracts

0

0

0

0

Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Other Observable Inputs (Level 2)

Derivative contracts

348

342

Auction rate securities

0

0

28,667

20,338

Liabilities

Derivative contracts

2

8

2

8

Fair Value, Measurements, Recurring | Fair value measurement at reporting date using Significant Unobservable Inputs (Level 3)

Derivative contracts

0

0

Auction rate securities

120

153

120

153

Liabilities

Derivative contracts

0

0

$ 0

$ 0

[1]	This balance represents cash collateral received in connection with our securities lending program, which was invested in reverse repurchase agreements maturing within three months.

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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