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v3.21.1

Description of Business and Significant Accounting Policies - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 26, 2021 USD ($) | Mar. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($)
Product Information [Line Items] |  |  |
Number of reportable segments | segment |  | 1 |
Incentive credits |  | $ 25 |
Prepayments offsetting accrued health insurance costs |  | $ 52 | $ 49
Subsequent Event |  |  |
Product Information [Line Items] |  |  |
Performance obligation period (in months) | 12 months |  |
Recovery credit program, maximum allowed amount | $ 145 |  |
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 |  | $ 70 | $ 58

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