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Condensed Consolidating Financial Statements - Cash Flows (Detail) - USD ($)
$ in Millions
9 Months Ended
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