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Condensed Consolidating Financial Statements - Cash Flows (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Condensed Cash Flow Statements Captions [Line Items] |  |
Operating activities | $ 2,852 | $ 2,658
Investing activities | (2,096) | (1,506)
Financing activities | 2,080 | (1,015)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents | 1 |
Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents | 2,837 | 137
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period | 183 | 293
Cash, cash equivalents and restricted cash and cash equivalents at end of period | 3,020 | 430
WM [Member] | Reportable Legal Entities [Member] |  |
Condensed Cash Flow Statements Captions [Line Items] |  |
Intercompany activity | 2,863 |
Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents | 2,863 |
Cash, cash equivalents and restricted cash and cash equivalents at end of period | 2,863 |
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
Condensed Cash Flow Statements Captions [Line Items] |  |
Operating activities | 2,852 | 2,658
Investing activities | (2,096) | (1,506)
Financing activities | 2,080 | (1,015)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents | 1 |
Intercompany activity | (2,863) |
Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents | (26) | 137
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period | 183 | 293
Cash, cash equivalents and restricted cash and cash equivalents at end of period | $ 157 | $ 430

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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