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Condensed Consolidating Financial Statements - Cash Flows (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Cash Flow Statements Captions [Line Items]      
Operating activities $ 3,874 $ 3,570 $ 3,180
Investing activities (2,376) (2,169) (1,620)
Financing activities 1,964 (1,508) (1,361)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents 2 (3)  
Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents 3,464 (110) 199
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period 183 293 94
Cash, cash equivalents and restricted cash and cash equivalents at end of period 3,647 183 293
WM [Member] | Reportable Legal Entities [Member]      
Condensed Cash Flow Statements Captions [Line Items]      
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents 3,485    
Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents 3,485    
Cash, cash equivalents and restricted cash and cash equivalents at end of period 3,485    
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]      
Condensed Cash Flow Statements Captions [Line Items]      
Operating activities 3,874 3,570 3,180
Investing activities (2,376) (2,169) (1,620)
Financing activities 1,964 (1,508) (1,361)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents (3,485) (3)  
Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents (21) (110) 199
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period 183 293 94
Cash, cash equivalents and restricted cash and cash equivalents at end of period $ 162 $ 183 $ 293