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Receivables (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) Countries Customers | Dec. 31, 2020 USD ($) Customers Countries | Dec. 31, 2019 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |
Maximum Percentage Gross Trade Receivables From One Geographic Segment |  | 10.00% |  | 10.00% |  |
Maximum Percentage Gross Trade Receivables From One Customer |  | 10.00% |  | 10.00% |  |
NumberOfCountriesExceedReceivablesThreshold | Countries |  | 1 |  | 1 |  |
NumberOfCustomersExceedReceivablesThreshold | Customers |  | 0 |  | 0 |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period |  | $ 824 | [1] | $ 776 | [1] | $ 738
Provision (a) | [2] | (19) |  | 58 |  | 50
Other (b) | [3] | (51) |  | (10) |  | (12)
Balance at End of Period (c) | [1] | $ 754 |  | $ 824 |  | $ 776
UNITED STATES | Geographic Concentration Risk | Accounts Receivable |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage |  | 34.00% |  | 32.00% |  |
[1] | The allowance for credit losses in all years is primarily comprised of a full reserve against accounts receivable with our primary customer in Venezuela.
[2] | Represents increases to allowance for credit losses charged to costs and expenses, net of recoveries.
[3] | Includes write-offs, balance sheet reclassifications, and other activity.

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