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Marketable Securities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Marketable Securities [Line Items] |  |  |  |
Total cash and cash equivalents | $ 15,512 | $ 12,574 |  |
Total restricted cash | 2,336 | 1,913 |  |
Due in one year or less | 8,539 |  |  |
Due between one and five years | 4,875 |  |  |
Total available-for-sale securities with contractual maturities | 13,414 |  |  |
Sales proceeds from investments classified as available-for-sale and sold prior to maturity | 5,600 | 8,500 | $ 7,900 |
Total | 17,848 | 15,160 | 17,332 | $ 21,189
Continuing Operations [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Total cash and cash equivalents | 15,512 | 12,574 |  |
Total | 17,848 | 14,487 | $ 16,588 |
Cash And Cash Equivalents [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Cash, cash equivalents and time deposits | 6,962 | 5,692 |  |
Available-for-sale securities | 8,550 | 6,882 |  |
Cash And Cash Equivalents [Member] | Level 2 [Member] | U.S. government and agencies [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 750 | 1,158 |  |
Cash And Cash Equivalents [Member] | Level 2 [Member] | Corporate Debt [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 3,032 | 2,524 |  |
Cash And Cash Equivalents [Member] | Level 2 [Member] | Sovereign Debt [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 1,954 | 1,399 |  |
Cash And Cash Equivalents [Member] | Level 1 [Member] | Money market funds [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 2,814 | 1,801 |  |
Marketable Securities [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 8,313 | 11,841 |  |
Marketable Securities [Member] | Level 2 [Member] | U.S. government and agencies [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 3,310 | 5,886 |  |
Marketable Securities [Member] | Level 2 [Member] | Corporate Debt [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 3,665 | 3,611 |  |
Marketable Securities [Member] | Level 2 [Member] | Sovereign Debt [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 703 | 2,147 |  |
Marketable Securities [Member] | Level 2 [Member] | Mortgage and asset-backed [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 635 | 197 |  |
Other Current Assets and Other Assets [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Cash, cash equivalents and time deposits | 219 | 248 |  |
Other Current Assets and Other Assets [Member] | Level 1 [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Available-for-sale securities | 2,117 | 1,665 |  |
Other Current Assets [Member] | Continuing Operations [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Total restricted cash | 1,745 | 1,382 |  |
Other Assets [Member] | Continuing Operations [Member] |  |  |  |
Marketable Securities [Line Items] |  |  |  |
Total restricted cash | $ 591 | $ 531 |  |

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