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Marketable Securities Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Marketable Securities [Line Items] |  |  |
Total cash and cash equivalents | $ 12,864 |  | $ 12,960
Total restricted cash | 2,700 |  | 2,218
Due in one year or less | 8,673 |  |
Due between one and five years | 5,474 |  |
Total available-for-sale securities with contractual maturities | 14,147 |  |
Sale proceeds from investments classified as available-for-sale and sold prior to maturity | 626 | $ 2,600 |
Cash and Cash Equivalents [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Cash, cash equivalents and time deposits | 6,857 |  | 6,077
Available-for-sale securities | 6,007 |  | 6,883
Cash and Cash Equivalents [Member] | Level 2 [Member] | U.S. government and agencies [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 1,128 |  | 1,158
Cash and Cash Equivalents [Member] | Level 2 [Member] | Corporate debt [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 2,459 |  | 2,524
Cash and Cash Equivalents [Member] | Level 2 [Member] | Sovereign debt [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 652 |  | 1,399
Cash and Cash Equivalents [Member] | Level 1 [Member] | Money market funds [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 1,768 |  | 1,802
Marketable Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 10,260 |  | 11,841
Marketable Securities [Member] | Level 2 [Member] | U.S. government and agencies [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 4,053 |  | 5,886
Marketable Securities [Member] | Level 2 [Member] | Corporate debt [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 3,974 |  | 3,611
Marketable Securities [Member] | Level 2 [Member] | Mortgage and asset-backed [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 370 |  | 197
Marketable Securities [Member] | Level 2 [Member] | Sovereign debt [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 1,863 |  | 2,147
Other Current Assets and Other Assets [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Cash, cash equivalents and time deposits | 547 |  | 531
Other Current Assets and Other Assets [Member] | Level 1 [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | 2,153 |  | 1,687
Other Current Assets and Other Assets [Member] | Level 1 [Member] | Money market funds [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-sale securities | $ 2,153 |  | $ 1,687

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