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Revenue (Tables) | 3 Months Ended
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Mar. 31, 2021
Revenues [Abstract] |
Disaggregation of Revenue | Our revenues are derived primarily from sales to customers in North America and Internationally, principally Europe. Net sales from these geographic markets, by segment, were as follows, in millions:
| Three Months Ended March 31, 2021
| Plumbing Products |  | Decorative Architectural Products |  | Total
Primary geographic markets: |  |  |  |  |
North America | $ | 808 |  |  | $ | 721 |  |  | $ | 1,529 |
International, principally Europe | 441 |  |  | — |  |  | 441 |
Total | $ | 1,249 |  |  | $ | 721 |  |  | $ | 1,970 |
| Three Months Ended March 31, 2020
| Plumbing Products |  | Decorative Architectural Products |  | Total
Primary geographic markets: |  |  |  |  |
North America | $ | 632 |  |  | $ | 626 |  |  | $ | 1,258 |
International, principally Europe | 323 |  |  | — |  |  | 323 |
Total | $ | 955 |  |  | $ | 626 |  |  | $ | 1,581 |
Financing Receivable, Allowance for Credit Loss | Changes in the allowance for credit losses deducted from accounts receivable were as follows, in millions:
| Three Months Ended March 31, 2021 |  | Twelve Months Ended December 31, 2020
Balance at January 1 | $ | 7 |  |  | $ | 5 |
Provision for expected credit losses during the period | 1 |  |  | 3 |
Write-offs charged against the allowance | (1) |  |  | (2) |
Recoveries of amounts previously written off | 1 |  |  | 1 |
Other (A) | (1) |  |  | — |
Balance at end of period | $ | 7 |  |  | $ | 7 |
(A) As a result of Hüppe being considered held for sale, $1 million for the three month period ended March 31, 2021 was removed from allowance for credit losses.

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