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Financial Instruments (Schedule of Cash, Cash Equivalents and Marketable Securities) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Cash and Cash Equivalents [Line Items] |  |  |
Cash |  | $ 1,630 | $ 1,938
Cash and cash equivalents |  | 4,166 | 5,300
Marketable securities |  | 623 | 906
Proceeds from sale of available-for-sale securities |  | 260 |
Cash and Cash Equivalents [Member] |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Cash |  | 1,630 | 1,938
Marketable Securities [Member] |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Cash |  | 0 | 0
Fair Value, Inputs, Level 1 [Member] |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Money market funds |  | 412 | 550
U.S. Treasury securities | [1] | 529 | 788
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Money market funds |  | 412 | 550
U.S. Treasury securities | [1] | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member] |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Money market funds |  | 0 | 0
U.S. Treasury securities | [1] | 529 | 788
Fair Value, Inputs, Level 2 [Member] |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Certificate of deposits / time deposits | [2] | 2,218 | 2,930
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Certificate of deposits / time deposits | [2] | 2,124 | 2,812
Fair Value, Inputs, Level 2 [Member] | Marketable Securities [Member] |  |  |
Cash and Cash Equivalents [Line Items] |  |  |
Certificate of deposits / time deposits | [2] | $ 94 | $ 118
[1] | Available-for-sale securities are reported at estimated fair value with unrealized gains and losses reported as component of accumulated other comprehensive loss. Proceeds from the sale of available-for-sale securities were $260 in the three months ended March 31, 2016.
[2] | Held-to-maturity investments are reported at amortized cost.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 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=49167202&loc=d3e26626-111562 Reference 3: 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 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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