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Segment and Related Information - Summary (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 3,842 | $ 3,822 | $ 3,739 | $ 3,511 | $ 3,652 | $ 3,716 | $ 3,677 | $ 3,440 | $ 14,914 | $ 14,485 | $ 13,609
Income from operations | 767 | $ 699 | $ 715 | $ 608 | 704 | $ 701 | $ 673 | $ 558 | 2,789 | 2,636 | 2,296
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,477 | 1,376 | 1,301
Capital Expenditures |  |  |  |  |  |  |  |  | 1,671 | 1,568 | 1,347
Total Assets | 22,650 |  |  |  | 21,829 |  |  |  | 22,650 | 21,829 | 20,859
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 18,024 | 17,370 | 16,246
Total Assets | 22,896 |  |  |  | 22,116 |  |  |  | 22,896 | 22,116 | 21,137
Intercompany Operating Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (3,110) | (2,885) | (2,637)
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | (540) | (585) | (550)
Depreciation and amortization |  |  |  |  |  |  |  |  | 30 | 45 | 56
Capital Expenditures |  |  |  |  |  |  |  |  | 200 | 92 | 45
Total Assets | 1,487 |  |  |  | 1,327 |  |  |  | 1,487 | 1,327 | 1,401
Elimination of Intercompany Investments and Advances [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Assets | (246) |  |  |  | (287) |  |  |  | (246) | (287) | (278)
Operating Group Total [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 14,914 | 14,485 | 13,609
Operating Group Total [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 18,024 | 17,370 | 16,246
Income from operations |  |  |  |  |  |  |  |  | 3,329 | 3,221 | 2,846
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,447 | 1,331 | 1,245
Capital Expenditures |  |  |  |  |  |  |  |  | 1,471 | 1,476 | 1,302
Total Assets | 21,409 |  |  |  | 20,789 |  |  |  | 21,409 | 20,789 | 19,736
Operating Group Total [Member] | Intercompany Operating Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (3,110) | (2,885) | (2,637)
Solid Waste [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 12,622 | 12,167 | 11,516
Solid Waste [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 15,537 | 14,832 | 13,968
Income from operations |  |  |  |  |  |  |  |  | 3,395 | 3,289 | 2,946
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,356 | 1,228 | 1,144
Capital Expenditures |  |  |  |  |  |  |  |  | 1,399 | 1,383 | 1,198
Total Assets | 19,838 |  |  |  | 19,004 |  |  |  | 19,838 | 19,004 | 18,247
Solid Waste [Member] | Intercompany Operating Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (2,915) | (2,665) | (2,452)
Tier 1 [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 4,805 | 4,574 | 4,330
Tier 1 [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 5,868 | 5,576 | 5,241
Income from operations |  |  |  |  |  |  |  |  | 1,642 | 1,538 | 1,430
Depreciation and amortization |  |  |  |  |  |  |  |  | 510 | 451 | 424
Capital Expenditures |  |  |  |  |  |  |  |  | 595 | 603 | 452
Total Assets | 6,958 |  |  |  | 6,528 |  |  |  | 6,958 | 6,528 | 6,188
Tier 1 [Member] | Intercompany Operating Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (1,063) | (1,002) | (911)
Tier 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,135 | 2,116 | 1,996
Tier 2 [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,622 | 2,559 | 2,400
Income from operations |  |  |  |  |  |  |  |  | 542 | 552 | 522
Depreciation and amortization |  |  |  |  |  |  |  |  | 232 | 203 | 190
Capital Expenditures |  |  |  |  |  |  |  |  | 257 | 185 | 157
Total Assets | 3,761 |  |  |  | 3,749 |  |  |  | 3,761 | 3,749 | 3,562
Tier 2 [Member] | Intercompany Operating Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (487) | (443) | (404)
Tier 3 [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 5,682 | 5,477 | 5,190
Tier 3 [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 7,047 | 6,697 | 6,327
Income from operations |  |  |  |  |  |  |  |  | 1,211 | 1,199 | 994
Depreciation and amortization |  |  |  |  |  |  |  |  | 614 | 574 | 530
Capital Expenditures |  |  |  |  |  |  |  |  | 547 | 595 | 589
Total Assets | 9,119 |  |  |  | 8,727 |  |  |  | 9,119 | 8,727 | 8,497
Tier 3 [Member] | Intercompany Operating Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | (1,365) | (1,220) | (1,137)
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,292 | 2,318 | 2,093
Other [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,487 | 2,538 | 2,278
Income from operations |  |  |  |  |  |  |  |  | (66) | (68) | (100)
Depreciation and amortization |  |  |  |  |  |  |  |  | 91 | 103 | 101
Capital Expenditures |  |  |  |  |  |  |  |  | 72 | 93 | 104
Total Assets | $ 1,571 |  |  |  | $ 1,785 |  |  |  | 1,571 | 1,785 | 1,489
Other [Member] | Intercompany Operating Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ (195) | $ (220) | $ (185)

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