Fair Value Measurements (Fair Value Hierarchy) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015 |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | $ 5,674 | |
Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 5,674 | $ 5,016 |
Other Assets | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Marketable available-for-sale equity securities | 17 | 18 |
Deferred compensation plan assets | 27 | 20 |
Notes payable to EMC | Level 2 | Notes payable | EMC | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Debt Instrument | | 1,474 |
Other Liabilities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Deferred compensation plan liabilities | 27 | 20 |
Time deposits | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | | 12 |
U.S. Government and agency obligations | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 961 | 750 |
U.S. and foreign corporate debt securities | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 3,959 | 3,252 |
Foreign governments and multi-national agency obligations | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 29 | 35 |
Municipal obligations | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 500 | 706 |
Asset-backed securities | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 8 | 20 |
Mortgage-backed securities | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 217 | 241 |
Total cash equivalents | Cash and Cash Equivalents | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 2,449 | 1,768 |
Money-market funds | Cash and Cash Equivalents | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 2,374 | 1,763 |
Time deposits | Cash and Cash Equivalents | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 13 | 5 |
Municipal obligations | Cash and Cash Equivalents | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 62 | |
Fair Value, Measurements, Recurring | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 5,674 | 5,016 |
Fair Value, Measurements, Recurring | Short Term Investments | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 667 | 543 |
Fair Value, Measurements, Recurring | Short Term Investments | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 5,007 | 4,473 |
Fair Value, Measurements, Recurring | Other Assets | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Marketable available-for-sale equity securities | 17 | 18 |
Fair Value, Measurements, Recurring | Other Assets | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Marketable available-for-sale equity securities | 17 | 18 |
Fair Value, Measurements, Recurring | Other Assets | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Marketable available-for-sale equity securities | 0 | 0 |
Fair Value, Measurements, Recurring | Other current assets | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Forward contracts, asset | 2 | |
Fair Value, Measurements, Recurring | Other current assets | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Forward contracts, asset | 0 | |
Fair Value, Measurements, Recurring | Other current assets | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Forward contracts, asset | 2 | |
Fair Value, Measurements, Recurring | Accrued expense and other | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Forward contracts, liability | | (1) |
Fair Value, Measurements, Recurring | Accrued expense and other | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Forward contracts, liability | | 0 |
Fair Value, Measurements, Recurring | Accrued expense and other | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Forward contracts, liability | | (1) |
Fair Value, Measurements, Recurring | Time deposits | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | | 12 |
Fair Value, Measurements, Recurring | Time deposits | Short Term Investments | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | | 0 |
Fair Value, Measurements, Recurring | Time deposits | Short Term Investments | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | | 12 |
Fair Value, Measurements, Recurring | U.S. Government and agency obligations | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 961 | 750 |
Fair Value, Measurements, Recurring | U.S. Government and agency obligations | Short Term Investments | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 667 | 543 |
Fair Value, Measurements, Recurring | U.S. Government and agency obligations | Short Term Investments | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 294 | 207 |
Fair Value, Measurements, Recurring | U.S. and foreign corporate debt securities | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 3,959 | 3,252 |
Fair Value, Measurements, Recurring | U.S. and foreign corporate debt securities | Short Term Investments | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Fair Value, Measurements, Recurring | U.S. and foreign corporate debt securities | Short Term Investments | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 3,959 | 3,252 |
Fair Value, Measurements, Recurring | Foreign governments and multi-national agency obligations | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 29 | 35 |
Fair Value, Measurements, Recurring | Foreign governments and multi-national agency obligations | Short Term Investments | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Fair Value, Measurements, Recurring | Foreign governments and multi-national agency obligations | Short Term Investments | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 29 | 35 |
Fair Value, Measurements, Recurring | Municipal obligations | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 500 | 706 |
Fair Value, Measurements, Recurring | Municipal obligations | Short Term Investments | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Fair Value, Measurements, Recurring | Municipal obligations | Short Term Investments | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 500 | 706 |
Fair Value, Measurements, Recurring | Asset-backed securities | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 8 | 20 |
Fair Value, Measurements, Recurring | Asset-backed securities | Short Term Investments | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Fair Value, Measurements, Recurring | Asset-backed securities | Short Term Investments | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 8 | 20 |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Short Term Investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 217 | 241 |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Short Term Investments | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 0 | 0 |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Short Term Investments | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Short-term investments | 217 | 241 |
Fair Value, Measurements, Recurring | Total cash equivalents | Cash and Cash Equivalents | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 2,449 | 1,768 |
Fair Value, Measurements, Recurring | Total cash equivalents | Cash and Cash Equivalents | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 2,374 | 1,763 |
Fair Value, Measurements, Recurring | Total cash equivalents | Cash and Cash Equivalents | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 75 | 5 |
Fair Value, Measurements, Recurring | Money-market funds | Cash and Cash Equivalents | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 2,374 | 1,763 |
Fair Value, Measurements, Recurring | Money-market funds | Cash and Cash Equivalents | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 2,374 | 1,763 |
Fair Value, Measurements, Recurring | Money-market funds | Cash and Cash Equivalents | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 0 | 0 |
Fair Value, Measurements, Recurring | Time deposits | Cash and Cash Equivalents | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 13 | 5 |
Fair Value, Measurements, Recurring | Time deposits | Cash and Cash Equivalents | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 0 | 0 |
Fair Value, Measurements, Recurring | Time deposits | Cash and Cash Equivalents | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 13 | $ 5 |
Fair Value, Measurements, Recurring | Municipal obligations | Cash and Cash Equivalents | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 62 | |
Fair Value, Measurements, Recurring | Municipal obligations | Cash and Cash Equivalents | Level 1 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | 0 | |
Fair Value, Measurements, Recurring | Municipal obligations | Cash and Cash Equivalents | Level 2 | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Cash equivalents | $ 62 | |