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Supplementary Information Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 01, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 1,980 |  |  | $ 2,270 | $ 1,657 |  |
Restricted Cash |  |  |  | $ 319 |  |  |  |
Cash and cash equivalents of discontinued operations |  | 0 |  |  | 2,254 | 1,965 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total Company |  | 2,400 | [1] |  | 5,024 | 4,128 | [1] | $ 7,914
Other Current Assets [Member] |  |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |  |  |  |
Restricted Cash |  | 420 |  |  | 460 | 462 |  |
Restricted cash of discontinued operations | [2],[3] | 0 |  |  | 40 | 44 |  |
Continuing Operations [Member] |  |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |  |  |  |
Cash, Cash Equivalents, and Restricted Cash, Continuing Operations |  | $ 2,400 |  |  | $ 2,730 | $ 2,119 |  |
[1] | See page 27 for reconciliation of cash and cash equivalents and restricted cash presented in Condensed Consolidated Balance Sheets to total cash, cash equivalents and restricted cash presented in the Condensed Consolidated Statements of Cash Flows.
[2] | Amount included in other current assets within assets of discontinued operations - current. Refer to Note 5 - Divestitures and Other Transactions, for additional information.
[3] | Refer to Note 5 - Divestitures and Other Transactions, for additional information.

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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=118932676&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=118951113&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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