Investments and Fair Value Measurement - Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Other long-term liabilities:
Warrants		$ 45
Recurring
Investments:
Debt securities	$ 2,366	2,370
Total financial assets	10,087	3,875
Accrued and other current liabilities:
Other	27	9
Other long-term liabilities:
Warrants	0	52
Embedded derivatives	0	2,018
Total financial liabilities	27	2,079
Recurring \| Money market funds
Financial Assets
Cash and cash equivalents	6,039	268
Restricted cash and cash equivalents	1,595	1,237
Recurring \| Debt securities
Investments:
Debt securities	2,366	2,370
Recurring \| Non-marketable equity securities
Investments:
Non-marketable equity securities	87	0
Recurring \| Level 1
Investments:
Total financial assets	7,634	1,505
Accrued and other current liabilities:
Other	0	0
Other long-term liabilities:
Warrants	0	0
Embedded derivatives	0	0
Total financial liabilities	0	0
Recurring \| Level 1 \| Money market funds
Financial Assets
Cash and cash equivalents	6,039	268
Restricted cash and cash equivalents	1,595	1,237
Recurring \| Level 1 \| Debt securities
Investments:
Debt securities	0	0
Recurring \| Level 1 \| Non-marketable equity securities
Investments:
Non-marketable equity securities	0	0
Recurring \| Level 2
Investments:
Total financial assets	0	0
Accrued and other current liabilities:
Other	0	0
Other long-term liabilities:
Warrants	0	0
Embedded derivatives	0	0
Total financial liabilities	0	0
Recurring \| Level 2 \| Money market funds
Financial Assets
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Recurring \| Level 2 \| Debt securities
Investments:
Debt securities	0	0
Recurring \| Level 2 \| Non-marketable equity securities
Investments:
Non-marketable equity securities	0	0
Recurring \| Level 3
Investments:
Total financial assets	2,453	2,370
Accrued and other current liabilities:
Other	27	9
Other long-term liabilities:
Warrants	0	52
Embedded derivatives	0	2,018
Total financial liabilities	27	2,079
Recurring \| Level 3 \| Money market funds
Financial Assets
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Recurring \| Level 3 \| Debt securities
Investments:
Debt securities	2,366	2,370
Recurring \| Level 3 \| Non-marketable equity securities
Investments:
Non-marketable equity securities	$ 87	$ 0

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Restricted Cash And Cash Equivalents, Fair Value Disclosure

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Fair value portion of accrued expenses.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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