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Basis of Presentation and Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |  |
Cash and cash equivalents | [1] | $ 3,559 | $ 1,342 | [2] |  |
Total cash and cash equivalents and restricted cash and cash equivalents shown in the condensed consolidated balance sheets | [2] | 3,658 | 1,431 |  | $ 2,858 | $ 2,666
Short-term investments [Member] |  |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |  |
Restricted cash and cash equivalents |  | 40 | 0 |  |  |
Long-term investments [Member] |  |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |  |
Restricted cash and cash equivalents |  | 59 | 0 |  |  |
Other current assets [Member] |  |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |  |
Restricted cash and cash equivalents |  | 0 | 14 |  |  |
Other noncurrent assets [Member] |  |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |  |
Restricted cash and cash equivalents |  | $ 0 | $ 75 |  |  |
[1] | Amounts may not add due to rounding.
[2] | Amounts may not add due to rounding.

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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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