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Condensed Consolidating Financial Statements - Cash Flows (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Condensed Cash Flow Statements Captions [Line Items]    
Operating activities $ 1,900 $ 1,784
Investing activities (1,565) (1,010)
Financing activities 1,822 (647)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents 2 (1)
Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents 2,159 126
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 2,342 419
WM [Member] | Reportable Legal Entities [Member]    
Condensed Cash Flow Statements Captions [Line Items]    
Intercompany activity 2,200  
Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents 2,200  
Cash, cash equivalents and restricted cash and cash equivalents at end of period 2,200  
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Condensed Cash Flow Statements Captions [Line Items]    
Operating activities 1,900 1,784
Investing activities (1,565) (1,010)
Financing activities 1,822 (647)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents 2 (1)
Intercompany activity (2,200)  
Increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents (41) 126
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 $ 142 $ 419