Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies.

Changes to Gross Insurance Liabilities

	2021(a)		2020
Balance as of January 1	$	664	$	575
Self-insurance expense		240		172
Cash paid and other		(170)		(151)
Other (b)		—		68
Balance as of December 31	$	734	$	664
Current portion as of December 31	$	191	$	175
Long-term portion as of December 31	$	543	$	489

(a) Based on current estimates, we anticipate that most of our insurance reserves will be settled in cash over the next six years.

(b) Insurance reserves of $68 million as of December 31, 2020 related to the acquisition of Advanced Disposal.