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v3.21.2

Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Jun. 30, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 31, 2021 |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201601Member |  | us-gaap:AccountingStandardsUpdate201409Member |
Expense related to valuation of inventory |  | $ 20 |  |
Accrued freight charges adjustments | $ 8 |  |  |
Prepaid Expenses and Other Current Assets |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Restricted cash |  |  |  | $ 32
Other Assets |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Restricted cash | $ 18 |  |  |

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