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Marketable Securities Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Marketable Securities [Line Items] |  |  |  |  |
Total cash and cash equivalents | $ 16,598 |  | $ 16,598 |  | $ 12,574
Total restricted cash | 2,322 |  | 2,322 |  | 1,913
Due in one year or less | 9,002 |  | 9,002 |  |
Due between one and five years | 5,360 |  | 5,360 |  |
Total available-for-sale securities with contractual maturities | 14,362 |  | 14,362 |  |
Sale proceeds from investments classified as available-for-sale and sold prior to maturity | 750 | $ 1,600 | 1,400 | $ 4,200 |
Cash and Cash Equivalents [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Cash, cash equivalents and time deposits | 6,758 |  | 6,758 |  | 5,692
Available-for-sale securities | 9,840 |  | 9,840 |  | 6,882
Cash and Cash Equivalents [Member] | Level 2 [Member] | U.S. government and agencies [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 1,179 |  | 1,179 |  | 1,158
Cash and Cash Equivalents [Member] | Level 2 [Member] | Corporate debt [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 2,903 |  | 2,903 |  | 2,524
Cash and Cash Equivalents [Member] | Level 2 [Member] | Sovereign debt [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 1,641 |  | 1,641 |  | 1,399
Cash and Cash Equivalents [Member] | Level 1 [Member] | Money market funds [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 4,117 |  | 4,117 |  | 1,801
Marketable Securities [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 9,133 |  | 9,133 |  | 11,841
Marketable Securities [Member] | Level 2 [Member] | U.S. government and agencies [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 4,045 |  | 4,045 |  | 5,886
Marketable Securities [Member] | Level 2 [Member] | Corporate debt [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 3,606 |  | 3,606 |  | 3,611
Marketable Securities [Member] | Level 2 [Member] | Mortgage and asset-backed [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 494 |  | 494 |  | 197
Marketable Securities [Member] | Level 2 [Member] | Sovereign debt [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 988 |  | 988 |  | 2,147
Other Current Assets and Other Assets [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Cash, cash equivalents and time deposits | 207 |  | 207 |  | 248
Other Current Assets and Other Assets [Member] | Level 1 [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | 2,115 |  | 2,115 |  | 1,665
Other Current Assets and Other Assets [Member] | Level 1 [Member] | Money market funds [Member] |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |
Available-for-sale securities | $ 2,115 |  | $ 2,115 |  | $ 1,665

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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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