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Marketable Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Marketable Securities [Line Items] |  |  |  |  |
Total marketable securities (including securities classified as cash equivalents) | $ 16,474 |  | $ 16,474 |  | $ 15,671
Total Restricted Cash | 2,225 |  | 2,225 |  | 2,173
Available-for-sale securities, due in one year or less | 12,083 |  | 12,083 |  |
Available-for-sale securities, due between one and five years | 3,205 |  | 3,205 |  |
Total available-for-sale securities with contractual maturities | 15,288 |  | 15,288 |  |
Marketable securities classified as cash equivalents | 8,172 |  | 8,172 |  | 8,163
Sales proceeds from investments classified as available-for-sale and sold prior to maturity | 1,600 | $ 1,100 | 5,800 | $ 7,000 |
Cash And Cash Equivalents [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Cash, cash equivalents and time deposits | 7,630 |  | 7,630 |  | 7,730
Marketable securities classified as cash equivalents | 8,300 |  | 8,300 |  | 7,500
Cash and Cash Equivalents and Marketable Securities [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 16,461 |  | 16,461 |  | 15,090
Trading securities | 13 |  | 13 |  | 581
Cash and Cash Equivalents and Marketable Securities [Member] | Level 2 [Member] | U.S. government and agencies [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 4,718 |  | 4,718 |  | 5,329
Cash and Cash Equivalents and Marketable Securities [Member] | Level 2 [Member] | Corporate and other debt securities [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 8,169 |  | 8,169 |  | 6,267
Cash and Cash Equivalents and Marketable Securities [Member] | Level 2 [Member] | Sovereign debt [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 2,382 |  | 2,382 |  | 1,219
Trading securities | 13 |  | 13 |  | 581
Cash and Cash Equivalents and Marketable Securities [Member] | Level 1 [Member] | Money Market Funds [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 1,192 |  | 1,192 |  | 2,275
Restricted Cash [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Cash, cash equivalents and time deposits | 613 |  | 613 |  | 833
Available-for-sale securities | 1,612 |  | 1,612 |  | 1,340
Restricted Cash [Member] | Level 1 [Member] | Money Market Funds [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | $ 1,612 |  | $ 1,612 |  | $ 1,340

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