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Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 4,059 | $ 1,696 | $ 3,371
Restricted cash (included in other current assets) |  |  |  | 6 | 14 | 0
Restricted cash (included in other assets) |  |  |  | 230 | 190 | 149
Total cash, cash equivalents and restricted cash at the end of the period in the statement of cash flows | $ 1,900 | $ 3,520 | $ 2,608 | $ 4,295 | 1,900 | 3,520
Consolidated Statement of Cash Flow: |  |  |  |  |  |
Acquisitions (net of cash acquired) | (42,226) | (1,181) | (524) |  |  |
Net cash used in investing activities | (43,285) | (2,877) | (2,470) |  |  |
Net decrease in cash, cash equivalents and restricted cash | 2,395 | (1,620) | 912 |  |  |
Cash, cash equivalents and restricted cash at the end of the period | 1,900 | 3,520 | 2,608 |  |  |
Cash, cash equivalents and restricted cash at the end of the period | 4,295 | 1,900 | 3,520 |  |  |
Accounting Standards Update 2016-18 | As Previously Reported |  |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |  |  |
Total cash, cash equivalents and restricted cash at the end of the period in the statement of cash flows | 1,696 | 3,371 | 2,459 |  | 1,696 | 3,371
Consolidated Statement of Cash Flow: |  |  |  |  |  |
Acquisitions (net of cash acquired) |  | (1,236) | (524) |  |  |
Net cash used in investing activities |  | (2,932) | (2,470) |  |  |
Net decrease in cash, cash equivalents and restricted cash |  | (1,675) | 912 |  |  |
Cash, cash equivalents and restricted cash at the end of the period | 1,696 | 3,371 | 2,459 |  |  |
Cash, cash equivalents and restricted cash at the end of the period |  | 1,696 | 3,371 |  |  |
Accounting Standards Update 2016-18 | Adjustments |  |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |  |  |
Total cash, cash equivalents and restricted cash at the end of the period in the statement of cash flows | 204 | 149 | 149 |  | $ 204 | $ 149
Consolidated Statement of Cash Flow: |  |  |  |  |  |
Acquisitions (net of cash acquired) |  | 55 |  |  |  |
Net cash used in investing activities |  | 55 |  |  |  |
Net decrease in cash, cash equivalents and restricted cash |  | 55 | 0 |  |  |
Cash, cash equivalents and restricted cash at the end of the period | $ 204 | 149 | 149 |  |  |
Cash, cash equivalents and restricted cash at the end of the period |  | $ 204 | $ 149 |  |  |

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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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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