Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 108	$ 103	$ 93
Charged to Costs and Expenses	5	9	8
Charged to Revenue	31	25	34
Deductions and Other	32	29	32
Ending balance	112	108	103
Reserve for obsolescence and shrinkage
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	8	10	5
Charged to Costs and Expenses	37	34	40
Charged to Revenue	0	0	0
Deductions and Other	34	36	35
Ending balance	11	8	10
Self-insurance reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	127	121	106
Charged to Costs and Expenses	179	169	180
Charged to Revenue	0	0	0
Deductions and Other	155	163	165
Ending balance	$ 151	$ 127	$ 121