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Financial Instruments (Schedule of Cash, Cash Equivalents and Marketable Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |
Cash |  | $ 1,839 | $ 1,839 | $ 1,938 |  |
Cash and cash equivalents |  | 4,452 | 4,452 | 5,300 | $ 3,324 | $ 6,910
Marketable securities |  | 1,080 | 1,080 | 906 |  |
Proceeds from sale of available-for-sale securities |  | 161 | 626 |  |  |
Cash and Cash Equivalents [Member] |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |
Cash |  | 1,839 | 1,839 | 1,938 |  |
Marketable Securities [Member] |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |
Cash |  | 0 | 0 | 0 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |
Money market funds |  | 0 | 0 | 550 |  |
U.S. Treasury securities | [1] | 161 | 161 | 788 |  |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |
Money market funds |  | 0 | 0 | 550 |  |
U.S. Treasury securities | [1] | 0 | 0 | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member] |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |
Money market funds |  | 0 | 0 | 0 |  |
U.S. Treasury securities | [1] | 161 | 161 | 788 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |
Certificate of deposits / time deposits | [2] | 3,532 | 3,532 | 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] | 2,613 | 2,613 | 2,812 |  |
Fair Value, Inputs, Level 2 [Member] | Marketable Securities [Member] |  |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |
Certificate of deposits / time deposits | [2] | $ 919 | $ 919 | $ 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 $161 and $626 in the three and nine months ended September 30, 2016, respectively.
[2] | Held-to-maturity investments are reported at amortized cost.

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