Description of Business and Significant Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($) segment	Dec. 31, 2021 USD ($)
Product Information [Line Items]
Number of reportable segments | segment		1
Incentive credits accrued	$ 25
Prepayments offsetting accrued health insurance costs	55	$ 55	$ 54
Non-US | Revenue | Foreign Sales
Product Information [Line Items]
Percent of concentration risk (less than)		1.00%
Health Care
Product Information [Line Items]
Prepayments offsetting accrued health insurance costs	$ 74	$ 74	$ 79